hadoop examples.jar中的错误

Question

I just installed Hadoop from the yahoo developers network running on a vm. I ran the following code after start-all.sh after cd-ing to the bin folder

hadoop jar hadoop-0.19.0.-examples.jar pi 10 1000000

I'm getting

java. io.IOException:Error opening jon jar:hadoop-0.18.0-examples.jar at org.apache.hadoop.util.main(RunJar.java:90) at org.apache.hadoop.mapred.JobShell.run(JobShell.java:54) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79) at org.apache.hadoop.mapred.JobShell.main(JobShell.java:68) caused by:java.util.ZipExcaption:error in opening zip file

How do i sort this out?

Answer 1

Please make sure that have below things in place

• Your examples.jar file is present in the path where you are running the above command. else you need to give complete path for the jar file.

  hadoop jar /usr/lib/hadoop-mapreduce/*example.jar pi 10 100000

• It has appropriate read permissions for the user that you are using to run the hadoop job.

If you still face issue, please update logs in your question.

Answer 2

You will face this issue if you are using older version of the java . Hadoop needs Java 7 or Java 8. Please check your JAVA version and update if needed.