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https://issues.apache.org/jira/browse/MAPREDUCE-4117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13249888#comment-13249888
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Devaraj K commented on MAPREDUCE-4117:
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Thanks Bobby for taking a look into the patch.
When the Job is failed and it doesn't contain any task attempts(i.e Job is
failed before launching any tasks itself) then the lastEvent will be null and
it will lead to NPE.
If the Job fails and job contains some attempts means the job should have
failed because of task failures. This case lastEvent will not be null.
> mapred job -status throws NullPointerException
> ----------------------------------------------
>
> Key: MAPREDUCE-4117
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4117
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: client, mrv2
> Affects Versions: 2.0.0, 3.0.0
> Reporter: Devaraj K
> Assignee: Devaraj K
> Priority: Critical
> Attachments: MAPREDUCE-4117.patch
>
>
> {code:xml}
> dev@ubuntudev-linux:~/hadoop/hadoop-trunk/bin$ ./mapred job -status
> job_1333408894669_0001
> Exception in thread "main" java.lang.NullPointerException
> at org.apache.hadoop.mapreduce.Job.getTaskFailureEventString(Job.java:512)
> at org.apache.hadoop.mapreduce.Job.toString(Job.java:463)
> at java.lang.String.valueOf(String.java:2838)
> at java.io.PrintStream.println(PrintStream.java:788)
> at org.apache.hadoop.mapreduce.tools.CLI.run(CLI.java:255)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:69)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:83)
> at org.apache.hadoop.mapred.JobClient.main(JobClient.java:1244)
> {code}
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