Hadoop2.5.1测试（运行自带的wordcount）

一、准备工作

启动hadoop（如有疑问见上篇博文），jps查看进程：

hadoop@h1:~$ jps
3395 SecondaryNameNode
5222 Jps
3177 NameNode
4394 JobHistoryServer
3565 ResourceManager

二、进行测试

1、建立输入文件：

echo "My first hadoop example. Hello Hadoop in input. " > input

2、在hadoop上建立目录：

hdfs dfs -mkdir -p /user/hadoop

查看建立的目录，

hadoop@h1:~$ hdfs dfs -ls /user
Found 1 items
drwxr-xr-x   - hadoop supergroup          0 2015-03-22 20:17 /user/hadoop

3、上传文件：

hdfs dfs -put input /user/hadoop

查看上传的文件，

hadoop@h1:~$ hdfs dfs -ls /user/hadoop
Found 1 items
-rw-r--r--   2 hadoop supergroup         49 2015-03-22 20:21 /user/hadoop/input

4、运行wordcount程序

hadoop jar /home/hadoop/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.1.jar wordcount /user/hadoop/input /user/hadoop/output

5、查看运行结果

hadoop@h1:~$ hdfs dfs -ls /user/hadoopFound 2 items
-rw-r--r--   2 hadoop supergroup         49 2015-03-22 20:21 /user/hadoop/input
drwxr-xr-x   - hadoop supergroup          0 2015-03-22 20:26 /user/hadoop/output
hadoop@h1:~$ hdfs dfs -ls /user/hadoop/output
Found 2 items
-rw-r--r--   2 hadoop supergroup          0 2015-03-22 20:26 /user/hadoop/output/_SUCCESS
-rw-r--r--   2 hadoop supergroup         64 2015-03-22 20:26 /user/hadoop/output/part-r-00000
hadoop@h1:~$ hdfs dfs -cat /user/hadoop/output/part-r-00000
Hadoop  1
Hello   1
My  1
example.    1
first   1
hadoop  1
in  1
input.  1