kafka安装及常用命令总结

柔情只为你懂 2022-07-15 09:55 246阅读 0赞

# 前提条件 #

*  zookeeper已经安装完毕，分别为hd1:2222,hd2:2222,hd3:2222,hd4:2222,hd5:2222
 *  已经在官方网站下载好了二进制包，kafka\_2.10-0.10.0.0.tgz
 *  将二进制包放到所有要安装kafka的节点上，host指定为：mq1,mq2,mq3,mq4

# 设置zookeeper #

进入hd1, 切换用户为hadoop用户，

进入zookeeper客户端

/home/hadooper/zookeeper/bin/zkCli.sh -server hd1:2222

进入到zookeeper控制台

输入如下命令，建立kafka相关目录

create /kafka ''

退出控制台

quit

# 解压二进制包 #

tar -xzvf kafka_2.10-0.10.0.0.tgz mv kafka_2.10-0.10.0.0 /usr/local/kafka

# 编辑配置文件 #

`编辑配置文件 /usr/local/kafka/config/server_properties如下`

broker.id=0 #不同的服务器，写不同的id，只要是不重复的无符号整数即可，建议连续上 port=9092 #可以指定其他端口 host.name=172.16.1.33 #请填写本台机器的内网地址 ################## 以下配置均可以进行优化 ############ num.network.threads=3 num.io.threads=8 socket.send.buffer.bytes=102400 socket.receive.buffer.bytes=102400 socket.request.max.bytes=104857600 log.dirs=/usr/local/kafka/logs num.partitions=1 num.recovery.threads.per.data.dir=1 log.retention.hours=168 log.segment.bytes=1073741824 log.retention.check.interval.ms=300000 log.cleaner.enable=false ################## 以上配置均可以进行优化 ############ #此处为zookeeper的配置，请按照实际情况配置 zookeeper.connect=hd1:2222,hd2:2222,hd3:2222,hd4:2222,hd5:2222,hd6:2222/kafka zookeeper.connection.timeout.ms=6000

配置文件的详细说明如下：

<table style="color:rgb(51,51,51); font-size:14px; line-height:26px; border-collapse:collapse"> 
 <tbody> 
 <tr> 
 <td style="width:175px; height:28px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> broker.id =0 </td> 
 <td style="width:381px; height:28px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 每一个broker在集群中的唯一表示，要求是正数。当该服务器的IP地址发生改变时，broker.id没有变化，则不会影响consumers的消息情况 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.dirs=/data/kafka-logs </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> kafka数据的存放地址，多个地址的话用逗号分割/data/kafka-logs-1，/data/kafka-logs-2 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:15px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> port =9092 </td> 
 <td style="width:381px; height:15px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> broker server服务端口 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> message.max.bytes =6525000 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 表示消息体的最大大小，单位是字节 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> num.network.threads =4 </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> broker处理消息的最大线程数，一般情况下不需要去修改 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:15px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> num.io.threads =8 </td> 
 <td style="width:381px; height:15px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> broker处理磁盘IO的线程数，数值应该大于你的硬盘数 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> background.threads =4 </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 一些后台任务处理的线程数，例如过期消息文件的删除等，一般情况下不需要去做修改 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:43px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> queued.max.requests =500 </td> 
 <td style="width:381px; height:43px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 等待IO线程处理的请求队列最大数，若是等待IO的请求超过这个数值，那么会停止接受外部消息，应该是一种自我保护机制。 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:46px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> host.name </td> 
 <td style="width:381px; height:46px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> broker的主机地址，若是设置了，那么会绑定到这个地址上，若是没有，会绑定到所有的接口上，并将其中之一发送到ZK，一般不设置 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> socket.send.buffer.bytes=100*1024 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> socket的发送缓冲区，socket的调优参数SO_SNDBUFF </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> socket.receive.buffer.bytes =100*1024 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> socket的接受缓冲区，socket的调优参数SO_RCVBUFF </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:63px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> socket.request.max.bytes =100*1024*1024 </td> 
 <td style="width:381px; height:63px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> socket请求的最大数值，防止serverOOM，message.max.bytes必然要小于socket.request.max.bytes，会被topic创建时的指定参数覆盖 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.segment.bytes =1024*1024*1024 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> topic的分区是以一堆segment文件存储的，这个控制每个segment的大小，会被topic创建时的指定参数覆盖 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:46px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.roll.hours =24*7 </td> 
 <td style="width:381px; height:46px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 这个参数会在日志segment没有达到log.segment.bytes设置的大小，也会强制新建一个segment会被&nbsp;topic创建时的指定参数覆盖 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:46px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.cleanup.policy = delete </td> 
 <td style="width:381px; height:46px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 日志清理策略选择有：delete和compact主要针对过期数据的处理，或是日志文件达到限制的额度，会被&nbsp;topic创建时的指定参数覆盖 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:92px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.retention.minutes=3days </td> 
 <td style="width:381px; height:92px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 数据存储的最大时间超过这个时间会根据log.cleanup.policy设置的策略处理数据，也就是消费端能够多久去消费数据 log.retention.bytes和log.retention.minutes任意一个达到要求，都会执行删除，会被topic创建时的指定参数覆盖 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:79px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.retention.bytes=-1 </td> 
 <td style="width:381px; height:79px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> topic每个分区的最大文件大小，一个topic的大小限制&nbsp;=分区数*log.retention.bytes。-1没有大小限log.retention.bytes和log.retention.minutes任意一个达到要求，都会执行删除，会被topic创建时的指定参数覆盖 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:47px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.retention.check.interval.ms=5minutes </td> 
 <td style="width:381px; height:47px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 文件大小检查的周期时间，是否处罚&nbsp;log.cleanup.policy中设置的策略 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.cleaner.enable=false </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 是否开启日志压缩 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.cleaner.threads =&nbsp;2 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 日志压缩运行的线程数 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.cleaner.io.max.bytes.per.second=None </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 日志压缩时候处理的最大大小 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:48px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.cleaner.dedupe.buffer.size=500*1024*1024 </td> 
 <td style="width:381px; height:48px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 日志压缩去重时候的缓存空间，在空间允许的情况下，越大越好 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.cleaner.io.buffer.size=512*1024 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 日志清理时候用到的IO块大小一般不需要修改 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.cleaner.io.buffer.load.factor =0.9 </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 日志清理中hash表的扩大因子一般不需要修改 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.cleaner.backoff.ms =15000 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 检查是否处罚日志清理的间隔 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.cleaner.min.cleanable.ratio=0.5 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 日志清理的频率控制，越大意味着更高效的清理，同时会存在一些空间上的浪费，会被topic创建时的指定参数覆盖 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:60px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.cleaner.delete.retention.ms =1day </td> 
 <td style="width:381px; height:60px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 对于压缩的日志保留的最长时间，也是客户端消费消息的最长时间，同log.retention.minutes的区别在于一个控制未压缩数据，一个控制压缩后的数据。会被topic创建时的指定参数覆盖 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:47px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.index.size.max.bytes =10*1024*1024 </td> 
 <td style="width:381px; height:47px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 对于segment日志的索引文件大小限制，会被topic创建时的指定参数覆盖 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:46px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.index.interval.bytes =4096 </td> 
 <td style="width:381px; height:46px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 当执行一个fetch操作后，需要一定的空间来扫描最近的offset大小，设置越大，代表扫描速度越快，但是也更好内存，一般情况下不需要搭理这个参数 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:114px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.flush.interval.messages=None </td> 
 <td style="width:381px; height:114px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> log文件”sync”到磁盘之前累积的消息条数,因为磁盘IO操作是一个慢操作,但又是一个”数据可靠性"的必要手段,所以此参数的设置,需要在"数据可靠性"与"性能"之间做必要的权衡.如果此值过大,将会导致每次"fsync"的时间较长(IO阻塞),如果此值过小,将会导致"fsync"的次数较多,这也意味着整体的client请求有一定的延迟.物理server故障,将会导致没有fsync的消息丢失. </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.flush.scheduler.interval.ms =3000 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 检查是否需要固化到硬盘的时间间隔 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:49px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.flush.interval.ms = None </td> 
 <td style="width:381px; height:49px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 仅仅通过interval来控制消息的磁盘写入时机,是不足的.此参数用于控制"fsync"的时间间隔,如果消息量始终没有达到阀值,但是离上一次磁盘同步的时间间隔达到阀值,也将触发. </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.delete.delay.ms =60000 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 文件在索引中清除后保留的时间一般不需要去修改 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:47px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> log.flush.offset.checkpoint.interval.ms =60000 </td> 
 <td style="width:381px; height:47px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 控制上次固化硬盘的时间点，以便于数据恢复一般不需要去修改 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> auto.create.topics.enable =true </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 是否允许自动创建topic，若是false，就需要通过命令创建topic </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> default.replication.factor =1 </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 是否允许自动创建topic，若是false，就需要通过命令创建topic </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> num.partitions =1 </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 每个topic的分区个数，若是在topic创建时候没有指定的话会被topic创建时的指定参数覆盖 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:15px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> </td> 
 <td style="width:381px; height:15px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:46px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> 以下是kafka中Leader,replicas配置参数 </td> 
 <td style="width:381px; height:46px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> controller.socket.timeout.ms =30000 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> partition&nbsp;leader与replicas之间通讯时,socket的超时时间 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> controller.message.queue.size=10 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> partition&nbsp;leader与replicas数据同步时,消息的队列尺寸 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:49px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> replica.lag.time.max.ms =10000 </td> 
 <td style="width:381px; height:49px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> replicas响应partition&nbsp;leader的最长等待时间，若是超过这个时间，就将replicas列入ISR(in-sync replicas)，并认为它是死的，不会再加入管理中 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:146px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> replica.lag.max.messages =4000 </td> 
 <td style="width:381px; height:146px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 如果follower落后与leader太多,将会认为此follower[或者说partition&nbsp;relicas]已经失效 ##通常,在follower与leader通讯时,因为网络延迟或者链接断开,总会导致replicas中消息同步滞后 ##如果消息之后太多,leader将认为此follower网络延迟较大或者消息吞吐能力有限,将会把此replicas迁移 ##到其他follower中. ##在broker数量较少,或者网络不足的环境中,建议提高此值. </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> replica.socket.timeout.ms=30*1000 </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> follower与leader之间的socket超时时间 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:47px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> replica.socket.receive.buffer.bytes=64*1024 </td> 
 <td style="width:381px; height:47px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> leader复制时候的socket缓存大小 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> replica.fetch.max.bytes =1024*1024 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> replicas每次获取数据的最大大小 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> replica.fetch.wait.max.ms =500 </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> replicas同leader之间通信的最大等待时间，失败了会重试 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> replica.fetch.min.bytes =1 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> fetch的最小数据尺寸,如果leader中尚未同步的数据不足此值,将会阻塞,直到满足条件 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> num.replica.fetchers=1 </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> leader进行复制的线程数，增大这个数值会增加follower的IO </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:48px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> replica.high.watermark.checkpoint.interval.ms =5000 </td> 
 <td style="width:381px; height:48px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 每个replica检查是否将最高水位进行固化的频率 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> controlled.shutdown.enable =false </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 是否允许控制器关闭broker ,若是设置为true,会关闭所有在这个broker上的leader，并转移到其他broker </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> controlled.shutdown.max.retries =3 </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 控制器关闭的尝试次数 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:47px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> controlled.shutdown.retry.backoff.ms =5000 </td> 
 <td style="width:381px; height:47px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 每次关闭尝试的时间间隔 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:47px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> leader.imbalance.per.broker.percentage =10 </td> 
 <td style="width:381px; height:47px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> leader的不平衡比例，若是超过这个数值，会对分区进行重新的平衡 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:48px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> leader.imbalance.check.interval.seconds =300 </td> 
 <td style="width:381px; height:48px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 检查leader是否不平衡的时间间隔 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> offset.metadata.max.bytes </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> 客户端保留offset信息的最大空间大小 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:29px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> kafka中zookeeper参数配置 </td> 
 <td style="width:381px; height:29px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:48px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> zookeeper.connect = localhost:2181 </td> 
 <td style="width:381px; height:48px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> zookeeper集群的地址，可以是多个，多个之间用逗号分割hostname1:port1,hostname2:port2,hostname3:port3 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> zookeeper.session.timeout.ms=6000 </td> 
 <td style="width:381px; height:32px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> ZooKeeper的最大超时时间，就是心跳的间隔，若是没有反映，那么认为已经死了，不易过大 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(0,0,0) rgb(33,33,33); padding:4px"> zookeeper.connection.timeout.ms =6000 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(0,0,0) rgb(0,0,0); padding:4px"> ZooKeeper的连接超时时间 </td> 
 </tr> 
 <tr> 
 <td style="width:175px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(0,0,0) rgb(33,33,33) rgb(33,33,33); padding:4px"> zookeeper.sync.time.ms =2000 </td> 
 <td style="width:381px; height:31px; border-style:solid; border-width:1px; border-color:rgb(0,0,0) rgb(33,33,33) rgb(33,33,33) rgb(0,0,0); padding:4px"> ZooKeeper集群中leader和follower之间的同步实际那 </td> 
 </tr> 
 </tbody> 
</table>

编辑完毕后，保存配置文件

# 常用命令 #

启动kafka:

/usr/local/kafka/bin/kafka-server-start.sh /usr/local/kafka/config/server.properties&

关闭kafka(关闭机器以前，一定要使用此命令来关闭kafka以后再进行关闭，否则启动时，有丢失队列中数据的风险)

/usr/local/kafka/bin/kafka-server-stop.sh

创建topic

/usr/local/kafka/bin/kafka-topics.sh --create--zookeeper hd1:2222,hd2:2222,hd3:2222,hd4:2222,hd5:2222 --replication-factor 3 --partitions 2 --topic nginx\_total1

\--replication-factor  副本数量

\--partitions  分区数量，调用的时候，编号从0开始

\--topic       主题的名称

# 转载内容 #

以下内容转载自 http://blog.jobbole.com/99195/，感谢分享

# （五）某个broker挂掉，本机器可重启 #

【结论】如果一个broker挂掉，且可以重启则处理步骤如下：  
（1）重启kafka进程  
（2）执行rebalance（由于已经设置配置项自动执行balance，因此此步骤一般可忽略）

详细分析见下面操作过程。  
1、topic的情况

Shell

集群中有4台机器，id为【2-5】,topic 有3个分区，每个分区2个副本，leader分别位于2，3，5中。

2、模拟机器down，kill掉进程  
分区0的leader位于id=5的broker中，kill掉这台机器的kafka进程

Shell

3、再次查看topic的情况

Shell

可以看到，分区0的leader已经移到id=2的机器上了，它的副本位于2，5这2台机器上，但处于同步状态的只有id=2这台机器。

4、重启kafka进程

Shell

5、再次查看状态

Shell

发现分区0的2个副本都已经处于同步状态，但leader依然为id=2的broker。

6、执行leader平衡  
详见leader的平衡部分。

Shell

如果配置文件中

Shell

则此步骤不需要执行。

7、重新查看topic

Shell

此时leader已经回到了id=5的broker，一切恢复正常。

# \#（六）某个broker挂掉且无法重启，需要其它机器代替 #

【结论】当一个broker挂掉，需要换机器时，采用以下步骤：  
1、将新机器kafka配置文件中的broker.id设置为与原机器一样  
2、启动kafka，注意kafka保存数据的目录不会自动创建，需要手工创建

详细分析过程如下：  
1、初始化机器，主要包括用户创建，kafka文件的复制等。

2、修改config/server.properties文件  
注意，只需要修改一个配置broker.id，且此配置必须与挂掉的那台机器相同，因为kafka是通过broker.id来区分集群中的机器的。此处设为

Shell

3、查看topic的当前状态

Shell

当前topic有3个分区，其中分区1的leader位于id=5的机器上。

4、关掉id=5的机器  
kill -9 \*\* 用于模拟机器突然down  
或者：

Shell

用于正常关闭

5、查看topic的状态

Shell

可见，topic的分区0的leader已经迁移到了id=2的机器上，且处于同步的机器只有一个了。

6、启动新机器

Shell

7、再看topic的状态

Shell

id=5的机器也处于同步状态了，但还需要将leader恢复到这台机器上。

8、执行leader平衡  
详见leader的平衡部分。

Shell

如果配置文件中

Shell

则此步骤不需要执行。

9、done

Shell

所有内容都恢复了

# \#（七）扩容 #

将一台机器加入kafka集群很容易，只需要为它分配一个独立的broker id，然后启动它即可。但是这些新加入的机器上面并没有任何的分区数据，所以除非将现有数据移动这些机器上，否则它不会做任何工作，直到创建新topic。因此，当你往集群加入机器时，你应该将其它机器上的一部分数据往这台机器迁移。  
数据迁移的工作需要手工初始化，然后自动完成。它的原理如下：当新机器起来后，kafka将其它机器的一些分区复制到这个机器上，并作为follower，当这个新机器完成复制并成为in-sync状态后，那些被复制的分区的一个副本会被删除。（都不会成为leader?)

1、将新机器kafka配置文件中的broker.id设置为与原机器一样  
2、启动kafka，注意kafka保存数据的目录不会自动创建，需要手工创建  
此时新建的topic都会优先分配leader到新增的机器上，但原有的topic不会将分区迁移过来。  
3、数据迁移，请见数据迁移部分。

# \#（八）数据迁移 #

以下步骤用于将现有数据迁移到新的broker中，假设需要将test\_topic与streaming\_ma30\_sdc的全部分区迁移到新的broker中（id 为6和7）  
1、创建一个json文件，用于指定哪些topic将被迁移过去  
cat topics-to-move.json

Shell

注意全角，半角符号，或者中文引号之类的问题。

2、先generate迁移后的结果，检查一下是不是你要想的效果

Shell

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 2 
 </div> 
 <div style="border-right-width: 1px !important; border-top-style: none; border-right-style: solid !important; border-bottom-style: none; border-left-style: none; border-right-color: rgb(222, 222, 222) !important; margin: 0px; padding: 0px 5px; font-size: inherit !important; font-family: inherit; text-align: right !important; height: inherit; line-height: inherit !important; font-weight: inherit !important; min-width: 1.2em !important; color: rgb(170, 170, 170) !important; background: none;">
 3 
 </div> 
 <div style="border-right-width: 1px !important; border-top-style: none; border-right-style: solid !important; border-bottom-style: none; border-left-style: none; border-right-color: rgb(222, 222, 222) !important; margin: 0px; padding: 0px 5px; font-size: inherit !important; font-family: inherit; text-align: right !important; height: inherit; line-height: inherit !important; font-weight: inherit !important; min-width: 1.2em !important; color: rgb(170, 170, 170) !important; background: none;">
 4 
 </div> 
 <div style="border-right-width: 1px !important; border-top-style: none; border-right-style: solid !important; border-bottom-style: none; border-left-style: none; border-right-color: rgb(222, 222, 222) !important; margin: 0px; padding: 0px 5px; font-size: inherit !important; font-family: inherit; text-align: right !important; height: inherit; line-height: inherit !important; font-weight: inherit !important; min-width: 1.2em !important; color: rgb(170, 170, 170) !important; background: none;">
 5 
 </div> 
 <div style="border-right-width: 1px !important; border-top-style: none; border-right-style: solid !important; border-bottom-style: none; border-left-style: none; border-right-color: rgb(222, 222, 222) !important; margin: 0px; padding: 0px 5px; font-size: inherit !important; font-family: inherit; text-align: right !important; height: inherit; line-height: inherit !important; font-weight: inherit !important; min-width: 1.2em !important; color: rgb(170, 170, 170) !important; background: none;">
 6 
 </div> 
 </div></td> 
 <td style="font-size: 13px; text-align: center; width: 3835px; border: none !important; margin: 0px !important; padding: 0px !important; vertical-align: top !important; font-family: Monaco, MonacoRegular, &quot;Courier New&quot;, monospace !important; background: none;"> 
 <div style="margin: 0px; padding-right: 0px; padding-left: 0px; text-align: left; white-space: pre; overflow: visible; tab-size: 4; border: none !important; padding-top: 5px !important; padding-bottom: 3px !important; line-height: 15px !important; background: none !important;"> 
 <div style="border: none; margin: 0px; padding: 0px 5px; font-family: inherit; height: inherit; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; background: none;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important;">bin 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">/ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important;">kafka 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">- 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important;">reassign 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">- 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important;">partitions 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: teal !important;">.sh 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">-- 
 zookeeper 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">192.168.172.98 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">2181 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">/ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important;">kafka 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">-- 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important;">topics 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">- 
 to 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">- 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important;">move 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">- 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important;">json 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">- 
 file 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important;">topics 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">- 
 to 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">- 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important;">move 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: teal !important;">.json 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">-- 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important;">broker 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">- 
 list 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"6,7" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> — 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: teal !important;">generate 
 </div> 
 <div style="border: none; margin: 0px; padding: 0px 5px; font-family: inherit; height: inherit; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; background: none;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: teal !important;">Current 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: teal !important;">partition 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: teal !important;">replica 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: teal !important;">assignment 
 </div> 
 <div style="border: none; margin: 0px; padding: 0px 5px; font-family: inherit; height: inherit; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; background: none;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"version" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">1 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partitions" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"streaming_ma30_sdc" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">2 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">2 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"test_topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">0 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">5 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">2 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"test_topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">2 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">3 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">4 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"streaming_ma30_sdc" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">1 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">5 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"streaming_ma30_sdc" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">0 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">4 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"test_topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">1 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">2 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">3 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"streaming_ma30_sdc" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">3 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">3 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"streaming_ma30_sdc" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">4 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">4 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 </div> 
 <div style="border: none; margin: 0px; padding: 0px 5px; font-family: inherit; height: inherit; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; background: none;">
 &nbsp; 
 </div> 
 <div style="border: none; margin: 0px; padding: 0px 5px; font-family: inherit; height: inherit; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; background: none;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: teal !important;">Proposed 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: teal !important;">partition 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: teal !important;">reassignment 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: teal !important;">configuration 
 </div> 
 <div style="border: none; margin: 0px; padding: 0px 5px; font-family: inherit; height: inherit; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; background: none;"> 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"version" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">1 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partitions" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"test_topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">0 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">7 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">6 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"streaming_ma30_sdc" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">2 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">7 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"test_topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">2 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">7 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">6 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"streaming_ma30_sdc" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">1 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">6 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"test_topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">1 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">6 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">7 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"streaming_ma30_sdc" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">0 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">7 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"streaming_ma30_sdc" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">4 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">7 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">{ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"topic" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"streaming_ma30_sdc" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"partition" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">3 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">, 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(221, 17, 68) !important;">"replicas" 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important;">: 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">[ 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 153, 153) !important;">6 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">] 
 <span style="border: 0px; margin: 0px; padding: 0px; font-size: inherit !important; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important;">} 
 </div> 
 </div></td> 
 </tr> 
 </tbody> 
</table>

分别列出了当前的状态以及迁移后的状态。  
把这2个json分别保存下来，第一个用来万一需要roll back的时候使用，第二个用来执行迁移。

3、执行迁移

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4、查看迁移过程

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5、当所有迁移的完成后，查看一下结果是不是你想要的

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完成

以上步骤将整个topic迁移，也可以只迁移其中一个或者多个分区。  
以下将test\_topic的分区1移到broker id为2，3的机器,分区2移到broker id为4,5的机器.  
【其实还是整个topic迁移好一点，不然准备迁移文件会很麻烦】

1、准备迁移配置文件  
cat custom-reassignment.json

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3、执行迁移

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4、查看迁移过程

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5、查看迁移结果

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# \#（九）机器下线 #

当一个机器下线时，kafka并不会自动将这台机器上的副本迁移到其它机器上，因此，我们需要手工进行迁移。这个过程会相当的无聊，kafka打算在0.8.2版本中添加此特性。  
有了吗？再找找。如果只是替换机器则不会有这个问题。

# \#（十）增加副本数量Increasing replication factor #

Increasing the replication factor of an existing partition is easy. Just specify the extra replicas in the custom reassignment json file and use it with the –execute option to increase the replication factor of the specified partitions.  
For instance, the following example increases the replication factor of partition 0 of topic foo from 1 to 3. Before increasing the replication factor, the partition’s only replica existed on broker 5. As part of increasing the replication factor, we will add more replicas on brokers 6 and 7.

The first step is to hand craft the custom reassignment plan in a json file-

> cat increase-replication-factor.json  
> \{“version”:1,  
> “partitions”:\[\{“topic”:”foo”,”partition”:0,”replicas”:\[5,6,7\]\}\]\}

Then, use the json file with the –execute option to start the reassignment process-  
> bin/kafka-reassign-partitions.sh –zookeeper localhost:2181 –reassignment-json-file increase-replication-factor.json –execute  
Current partition replica assignment

\{“version”:1,  
“partitions”:\[\{“topic”:”foo”,”partition”:0,”replicas”:\[5\]\}\]\}

Save this to use as the –reassignment-json-file option during rollback  
Successfully started reassignment of partitions  
\{“version”:1,  
“partitions”:\[\{“topic”:”foo”,”partition”:0,”replicas”:\[5,6,7\]\}\]\}  
The –verify option can be used with the tool to check the status of the partition reassignment. Note that the same increase-replication-factor.json (used with the –execute option) should be used with the –verify option

bin/kafka-reassign-partitions.sh –zookeeper localhost:2181 –reassignment-json-file increase-replication-factor.json –verify  
Status of partition reassignment:  
Reassignment of partition \[foo,0\] completed successfully  
You can also verify the increase in replication factor with the kafka-topics tool-  
> bin/kafka-topics.sh –zookeeper localhost:2181 –topic foo –describe  
Topic:foo PartitionCount:1 ReplicationFactor:3 Configs:  
Topic: foo Partition: 0 Leader: 5 Replicas: 5,6,7 Isr: 5,6,7

# \#（十一）leader的平衡 #

当一个broker down掉时，所有本来将它作为leader的分区会被将leader转移到其它broker。这意味着当这个broker重启时，它将不再担任何分区的leader，kafka的client也不会从这个broker来读取消息，导致资源的浪费。  
为了避免这种情况的发生，kafka增加了一个标记：优先副本（preferred replicas）。如果一个分区有3个副本，且这3个副本的优先级别分别为1，5，9，则1会作为leader。为了使kafka集群恢复默认的leader，需要运行以下命令：

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或者可以设置以下配置项，leader 会自动执行balance：

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这配置默认即为空，但需要经过一段时间后才会触发，约半小时。

#  #