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https://issues.apache.org/jira/browse/MAPREDUCE-6762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15429789#comment-15429789
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Hudson commented on MAPREDUCE-6762:
-----------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #10316 (See 
[https://builds.apache.org/job/Hadoop-trunk-Commit/10316/])
MAPREDUCE-6762. ControlledJob#toString failed with NPE when job status 
(varunsaxena: rev d37b45d613b768950d1cbe342961cd71776816ae)
* (edit) 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/Job.java
* (edit) 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapreduce/TestJob.java


> 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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