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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1813) NPE in PipeMapred.MRErrorThread
Date Mon, 07 Jun 2010 07:35:56 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12876148#action_12876148
] 

Amareshwari Sriramadasu commented on MAPREDUCE-1813:
----------------------------------------------------

Some comments on the patch:
1. The current test is not regression test. The test added in earlier patch with empty input,
should still be there.
2. Starting up and shutting down MiniMRCluster for every testcase will just increase the test
time. Can you run testStreamingMapStatus and testStreamingReduceStatus with single setup of
MiniMRCluster.
3. Minor : Can you rename mapAttemptID in method validateTaskStderr to just attemptID ?

> 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
>            Assignee: Ravi Gummadi
>             Fix For: 0.20.3
>
>         Attachments: 1813.patch, 1813.v1.patch
>
>
> 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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