Weiwei Yang created MAPREDUCE-6762:
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Summary: 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
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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