hadoop 2.x安装：安装结果测试

注意：本方法只适用于hadoop2.x

在我们安装之后即使使用jps获取了当前的进程，也未必安装成功，我们实际测试一下。注意关闭防火墙并启动hadoop集群。这里给出简单的测试：

[grid2@tiny1 ~]$ ## 创建两个文件
[grid2@tiny1 ~]$ cd ~
[grid2@tiny1 ~]$ mkdir input
[grid2@tiny1 ~]$ cd input
[grid2@tiny1 input]$ echo "hello world" >test1.txt
[grid2@tiny1 input]$ echo "hello hadoop" >test2.txt
[grid2@tiny1 input]$ cat test1.txt
hello world
[grid2@tiny1 input]$ cat test2.txt
hello hadoop

[grid2@tiny1 input]$ ## 将这两个文件拷贝至HDFS
[grid2@tiny1 ~]$ hadoop/hadoop-2.7.2/bin/hadoop fs -ls /
[grid2@tiny1 ~]$ hadoop/hadoop-2.7.2/bin/hadoop fs -put ~/input /in
[grid2@tiny1 ~]$ hadoop/hadoop-2.7.2/bin/hadoop fs -ls /
Found 1 items
drwxr-xr-x   - grid2 supergroup          0 2017-03-13 05:24 /in
[grid2@tiny1 ~]$ hadoop/hadoop-2.7.2/bin/hadoop fs -ls /in/*
Found 2 items
-rw-r--r--   1 grid supergroup         12 2017-06-21 20:28 /in/test1.txt
-rw-r--r--   1 grid supergroup         13 2017-06-21 20:28 /in/test2.txt

[grid2@tiny1 ~]$ ## 运行MapReduce
[grid2@tiny1 ~]$ hadoop/hadoop-2.7.2/bin/hadoop jar hadoop/hadoop-2.7.2/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar wordcount /in /out
17/03/13 05:54:10 INFO client.RMProxy: Connecting to ResourceManager at tiny1/192.168.132.101:8032
17/03/13 05:54:16 INFO input.FileInputFormat: Total input paths to process : 2
17/03/13 05:54:16 INFO mapreduce.JobSubmitter: number of splits:2
17/03/13 05:54:17 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1489354711598_0002
17/03/13 05:54:17 INFO impl.YarnClientImpl: Submitted application application_1489354711598_0002
17/03/13 05:54:18 INFO mapreduce.Job: The url to track the job: http://tiny1:8088/proxy/application_1489354711598_0002/
17/03/13 05:54:18 INFO mapreduce.Job: Running job: job_1489354711598_0002
17/03/13 05:54:34 INFO mapreduce.Job: Job job_1489354711598_0002 running in uber mode : false
17/03/13 05:54:34 INFO mapreduce.Job:  map 0% reduce 0%
17/03/13 05:55:55 INFO mapreduce.Job:  map 100% reduce 0%
17/03/13 05:56:46 INFO mapreduce.Job:  map 100% reduce 100%
17/03/13 05:56:49 INFO mapreduce.Job: Job job_1489354711598_0002 completed successfully
17/03/13 05:56:49 INFO mapreduce.Job: Counters: 49
        File System Counters
                FILE: Number of bytes read=55
                FILE: Number of bytes written=353368
                FILE: Number of read operations=0
                FILE: Number of large read operations=0
                FILE: Number of write operations=0
                HDFS: Number of bytes read=215
                HDFS: Number of bytes written=25
                HDFS: Number of read operations=9
                HDFS: Number of large read operations=0
                HDFS: Number of write operations=2
        Job Counters
                Launched map tasks=2
                Launched reduce tasks=1
                Data-local map tasks=2
                Total time spent by all maps in occupied slots (ms)=176701
                Total time spent by all reduces in occupied slots (ms)=32951
                Total time spent by all map tasks (ms)=176701
                Total time spent by all reduce tasks (ms)=32951
                Total vcore-milliseconds taken by all map tasks=176701
                Total vcore-milliseconds taken by all reduce tasks=32951
                Total megabyte-milliseconds taken by all map tasks=180941824
                Total megabyte-milliseconds taken by all reduce tasks=33741824
        Map-Reduce Framework
                Map input records=2
                Map output records=4
                Map output bytes=41
                Map output materialized bytes=61
                Input split bytes=190
                Combine input records=4
                Combine output records=4
                Reduce input groups=3
                Reduce shuffle bytes=61
                Reduce input records=4
                Reduce output records=3
                Spilled Records=8
                Shuffled Maps =2
                Failed Shuffles=0
                Merged Map outputs=2
                GC time elapsed (ms)=4814
                CPU time spent (ms)=5120
                Physical memory (bytes) snapshot=324501504
                Virtual memory (bytes) snapshot=6172119040
                Total committed heap usage (bytes)=253939712
        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=25
        File Output Format Counters
                Bytes Written=25
                
[grid2@tiny1 ~]$ ## 查看输出结果
[grid2@tiny1 ~]$ hadoop/hadoop-2.7.2/bin/hadoop fs -ls /
Found 3 items
drwxr-xr-x   - grid2 supergroup          0 2017-03-13 05:51 /in
drwxr-xr-x   - grid2 supergroup          0 2017-03-13 05:56 /out
drwx------   - grid2 supergroup          0 2017-03-13 05:54 /tmp
[grid2@tiny1 ~]$ hadoop/hadoop-2.7.2/bin/hadoop fs -ls /out/*
-rw-r--r--   1 grid2 supergroup          0 2017-03-13 05:56 /out/_SUCCESS
-rw-r--r--   1 grid2 supergroup         25 2017-03-13 05:56 /out/part-r-00000
[grid2@tiny1 ~]$ hadoop/hadoop-2.7.2/bin/hadoop fs -cat /out/part-r-00000
hadoop  1
hello   2
world   1

测试成功