运行hadoop中的例子程序PI

一时失言乱红尘 2022-02-26 00:22 257阅读 0赞

### 运行hadoop中的例子程序PI ###

*  命令
 *  结果

> 安装好hadoop集群之后，都会想着试一下自己的集群是否正常工作，最简单的方式就是运行hadoop提供的例子程序。

# 命令 #

hadoop jar hadoop-mapreduce-examples-2.6.4.jar pi 5 5

# 结果 #

[root@zk2 ~]# hadoop jar hadoop-mapreduce-examples-2.6.4.jar pi 5 5
    Number of Maps  = 5
    Samples per Map = 5
    Wrote input for Map #0
    Wrote input for Map #1
    Wrote input for Map #2
    Wrote input for Map #3
    Wrote input for Map #4
    Starting Job
    19/03/28 23:25:06 INFO client.RMProxy: Connecting to ResourceManager at /192.168.56.160:8032
    19/03/28 23:25:07 INFO input.FileInputFormat: Total input paths to process : 5
    19/03/28 23:25:07 INFO mapreduce.JobSubmitter: number of splits:5
    19/03/28 23:25:08 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1553786668014_0001
    19/03/28 23:25:08 INFO impl.YarnClientImpl: Submitted application application_1553786668014_0001
    19/03/28 23:25:08 INFO mapreduce.Job: The url to track the job: http://zk1:8088/proxy/application_1553786668014_0001/
    19/03/28 23:25:08 INFO mapreduce.Job: Running job: job_1553786668014_0001
    19/03/28 23:25:20 INFO mapreduce.Job: Job job_1553786668014_0001 running in uber mode : false
    19/03/28 23:25:20 INFO mapreduce.Job:  map 0% reduce 0%
    19/03/28 23:27:43 INFO mapreduce.Job:  map 80% reduce 0%
    19/03/28 23:27:45 INFO mapreduce.Job:  map 100% reduce 0%
    19/03/28 23:28:28 INFO mapreduce.Job:  map 100% reduce 100%
    19/03/28 23:28:29 INFO mapreduce.Job: Job job_1553786668014_0001 completed successfully
    19/03/28 23:28:30 INFO mapreduce.Job: Counters: 49
            File System Counters
                    FILE: Number of bytes read=116
                    FILE: Number of bytes written=642111
                    FILE: Number of read operations=0
                    FILE: Number of large read operations=0
                    FILE: Number of write operations=0
                    HDFS: Number of bytes read=1345
                    HDFS: Number of bytes written=215
                    HDFS: Number of read operations=23
                    HDFS: Number of large read operations=0
                    HDFS: Number of write operations=3
            Job Counters 
                    Launched map tasks=5
                    Launched reduce tasks=1
                    Data-local map tasks=5
                    Total time spent by all maps in occupied slots (ms)=734480
                    Total time spent by all reduces in occupied slots (ms)=36769
                    Total time spent by all map tasks (ms)=734480
                    Total time spent by all reduce tasks (ms)=36769
                    Total vcore-milliseconds taken by all map tasks=734480
                    Total vcore-milliseconds taken by all reduce tasks=36769
                    Total megabyte-milliseconds taken by all map tasks=752107520
                    Total megabyte-milliseconds taken by all reduce tasks=37651456
            Map-Reduce Framework
                    Map input records=5
                    Map output records=10
                    Map output bytes=90
                    Map output materialized bytes=140
                    Input split bytes=755
                    Combine input records=0
                    Combine output records=0
                    Reduce input groups=2
                    Reduce shuffle bytes=140
                    Reduce input records=10
                    Reduce output records=0
                    Spilled Records=20
                    Shuffled Maps =5
                    Failed Shuffles=0
                    Merged Map outputs=5
                    GC time elapsed (ms)=19784
                    CPU time spent (ms)=14600
                    Physical memory (bytes) snapshot=676265984
                    Virtual memory (bytes) snapshot=12362330112
                    Total committed heap usage (bytes)=626020352
            Shuffle Errors
                    BAD_ID=0
                    CONNECTION=0
                    IO_ERROR=0
                    WRONG_LENGTH=0
                    WRONG_MAP=0
                    WRONG_REDUCE=0
            File Input Format Counters 
                    Bytes Read=590
            File Output Format Counters 
                    Bytes Written=97
    Job Finished in 204.801 seconds
    Estimated value of Pi is 3.68000000000000000000

> 如果运行例子程序，出现以上结果，证明集群是正常工作的。