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https://issues.apache.org/jira/browse/MAPREDUCE-1813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871052#action_12871052
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Todd Lipcon commented on MAPREDUCE-1813:
----------------------------------------
I think this may be duplicate of MAPREDUCE-576 (solved by HADOOP-5623
backport). Could also be related to MAPREDUCE-1481
> NPE in PipeMapred.MRErrorThread
> -------------------------------
>
> Key: MAPREDUCE-1813
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1813
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: contrib/streaming
> Affects Versions: 0.20.1
> Reporter: Amareshwari Sriramadasu
> Fix For: 0.20.3
>
>
> Some reduce tasks fail with following NPE
> java.lang.RuntimeException: java.lang.NullPointerException
> at
> org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:325)
> at
> org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:540)
> at org.apache.hadoop.streaming.PipeReducer.close(PipeReducer.java:137)
> at
> org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:474)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:412)
> at org.apache.hadoop.mapred.Child.main(Child.java:159)
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.streaming.PipeMapRed$MRErrorThread.setStatus(PipeMapRed.java:517)
> at
> org.apache.hadoop.streaming.PipeMapRed$MRErrorThread.run(PipeMapRed.java:449)
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