測試hadoop的 WordCount

1、建立兩個文字

[[email protected] /]# mkdir input
[[email protected] /]# cd input
[[email protected] input]# echo "hello world" >test1.txt
[[email protected] input]# echo "hello hadoop" >test2.txt

2、將兩個txt文字copy到hadoop下

./代表input目錄下所有文字 /input代表hadoop根目錄吧  我也不清楚

[[email protected] input]# hadoop fs -put ./ /input 

3、檢視copy到hadoop的文字

[[email protected] input]# hadoop fs -ls /input
Found 2 items
-rw-r--r--   1 root supergroup         12 2017-05-10 04:09 /input/test1.txt
-rw-r--r--   1 root supergroup         13 2017-05-10 04:09 /input/test2.txt

4、檢視文字內容

[[email protected]
 
 input]# hadoop fs -cat /input/test1.txt 
hello world

5、執行wordcount的jar包，並輸出結果到/output

[[email protected] hadoop-2.7.3]# hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.3.jar wordcount /input/ /output

6、檢視執行結果

[[email protected] hadoop-2.7.3]# hadoop fs -ls /output
Found 2 items
-rw-r--r--   1 root supergroup          0 2017-05-10 08:03 /output/_SUCCESS
-rw-r--r--   1 root supergroup         25 2017-05-10 08:03 /output/part-r-00000
[
 
[email protected] hadoop-2.7.3]# hadoop fs -cat /output/part-r-00000
hadoop	1
hello	2
world	1