redis集群给新添加的节点分配槽道的操作

我会带着你远行 2022-05-09 07:24 96阅读 0赞

## 一、准备好redis集群如下： ##

> > > **`10.211.55.5:8001> cluster nodes da23623c6e915de5256bb2252cd1057d4f29e558 10.211.55.5:8003 master - 0 1538583619331 0 connected`**  
> > > 3f3049540ba60e30080847e78ccf832f94961da2 10.211.55.5:8004 slave 6f4a31fc322725fc4ed453a588f344fed4f261bf 0 1538583620339 2 connected  
> > > 6f4a31fc322725fc4ed453a588f344fed4f261bf 10.211.55.5:8001 myself,master - 0 0 2 connected 5461-10922  
> > > 8ce851252f32fcab268e77d3b3ed976d57d2f498 10.211.55.5:8000 master - 0 1538583622352 1 connected 0-5460  
> > > da7d09090520a0e6287ea12fe7f48225d6665f68 10.211.55.5:8002 master - 0 1538583621346 3 connected 10923-16383  
> > > 10.211.55.5:8001>

## 二、给8003节点分配50个槽道 ##

执行命令如下，8004是集群中的任意一个节点  
\[root@cenos01 src\]\# ./redis-trib.rb reshard 10.211.55.5:8004

> > > Performing Cluster Check (using node 10.211.55.5:8004)  
> > > S: 3f3049540ba60e30080847e78ccf832f94961da2 10.211.55.5:8004  
> > > slots: (0 slots) slave  
> > > replicates 6f4a31fc322725fc4ed453a588f344fed4f261bf  
> > > M: da7d09090520a0e6287ea12fe7f48225d6665f68 10.211.55.5:8002  
> > > slots:10923-16383 (5461 slots) master  
> > > 0 additional replica(s)  
> > > M: da23623c6e915de5256bb2252cd1057d4f29e558 10.211.55.5:8003  
> > > slots: (0 slots) master  
> > > 0 additional replica(s)  
> > > M: 6f4a31fc322725fc4ed453a588f344fed4f261bf 10.211.55.5:8001  
> > > slots:5461-10922 (5462 slots) master  
> > > 1 additional replica(s)  
> > > M: 8ce851252f32fcab268e77d3b3ed976d57d2f498 10.211.55.5:8000  
> > > slots:0-5460 (5461 slots) master  
> > > 0 additional replica(s)  
> > > \[OK\] All nodes agree about slots configuration.
> 
> > > Check for open slots…  
> > > Check slots coverage…  
> > > \[OK\] All 16384 slots covered.  
> > > How many slots do you want to move (from 1 to 16384)? `50`

> > > What is the receiving node ID? da23623c6e915de5256bb2252cd1057d4f29e558  
> > > \*\*\* The specified node is not known or not a master, please retry.  
> > > What is the receiving node ID? da23623c6e915de5256bb2252cd1057d4f29e558  
> > > Please enter all the source node IDs.  
> > > Type ‘all’ to use all the nodes as source nodes for the hash slots.  
> > > Type ‘done’ once you entered all the source nodes IDs.  
> > > Source node \#1:`all`  
> > > `这里使用all将会自动计算从所有主节点平均获取槽道移动`  
> > > `使用done，注意输入master节点的id，从cluster nodes中粘贴`

回车后,以下输入yes，就分配完成后

> > > Do you want to proceed with the proposed reshard plan (yes/no)? `yes`

查看分配后的结果：

> > > 10.211.55.5:8001> cluster nodes  
> > > da23623c6e915de5256bb2252cd1057d4f29e558 10.211.55.5:8003 master - 0 1538584291512 5 connected 0-15 5461-5477 10923-10938  
> > > 3f3049540ba60e30080847e78ccf832f94961da2 10.211.55.5:8004 slave 6f4a31fc322725fc4ed453a588f344fed4f261bf 0 1538584288492 2 connected  
> > > 6f4a31fc322725fc4ed453a588f344fed4f261bf 10.211.55.5:8001 myself,master - 0 0 2 connected 5478-10922  
> > > 8ce851252f32fcab268e77d3b3ed976d57d2f498 10.211.55.5:8000 master - 0 1538584293523 1 connected 16-5460  
> > > da7d09090520a0e6287ea12fe7f48225d6665f68 10.211.55.5:8002 master - 0 1538584292518 3 connected 10939-16383

**重新分配槽道,不能重新操作有数据的槽道,空槽道可以reshard,有数 据的需要手动迁移数据后在迁移槽道**