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https://issues.apache.org/jira/browse/MAPREDUCE-6762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15429939#comment-15429939
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Weiwei Yang commented on MAPREDUCE-6762:
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Thanks a lot [~varun_saxena].
> ControlledJob#toString failed with NPE when job status is not successfully
> updated
> ----------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6762
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6762
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.7.2
> Reporter: Weiwei Yang
> Fix For: 2.9.0
>
> Attachments: MAPREDUCE-6762.001.patch
>
>
> This issue was found from a cluster where Pig query occasionally failed on
> NPE. Pig uses JobControl API to track MR job status, but sometimes Job
> History Server failed to flush job meta files to HDFS which caused the status
> update failed. Then we get NPE in
> {{org.apache.hadoop.mapreduce.Job.getJobName}}. The result of this situation
> is quite confusing: Pig query failed, job history is missing, but the job
> status on Yarn is succeed.
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