无法在hadoop中使用内置wordcount jar文件

Question

I am struggling with the below code. can any one help me to sort out.

[cloudera@localhost ~]$ hadoop jar /usr/lib;

Exception in thread "main" java.io.IOException: Error opening job   jar:    /usr/lib
at org.apache.hadoop.util.RunJar.main(RunJar.java:135)
Caused by: java.util.zip.ZipException: error in opening zip file

at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:127)
at java.util.jar.JarFile.<init>(JarFile.java:135)
at java.util.jar.JarFile.<init>(JarFile.java:72)
at org.apache.hadoop.util.RunJar.main(RunJar.java:133)

[cloudera@localhost ~]$ 

I want to run the wordcount example jar in hadoop itself.But its not allowing to use the inbuild jar

Thanks, Anbu k.

Answer 1

You need to point to an actual jar. "/usr/lib" is not a jar file. Refer to this for the commands.

Answer 2

Try following command. Assuming, $HADOOP_HOME is declared and you have copied input data to HDFS.

$HADOOP_HOME/bin/hadoop jar $HADOOP_HOME/hadoop-*-examples.jar wordcount your_input_path your_output_path