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From "Milind Bhandarkar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1771) streaming hang when IOException in MROutputThread. (NPE)
Date Wed, 10 Oct 2007 18:42:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12533834
] 

Milind Bhandarkar commented on HADOOP-1771:
-------------------------------------------

The patch looks good. except that the try and catch statements (inside finally block) are
not aligned.

> streaming hang when IOException in MROutputThread. (NPE)
> --------------------------------------------------------
>
>                 Key: HADOOP-1771
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1771
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/streaming
>    Affects Versions: 0.13.1
>            Reporter: Koji Noguchi
>            Assignee: Koji Noguchi
>            Priority: Blocker
>             Fix For: 0.15.0
>
>         Attachments: h-1771-2.patch, h-1771-3.patch, h-1771.patch
>
>
> One streaming task hang and had stderr userlog as follows.
> {code}
> Exception in thread "Thread-5" java.lang.NullPointerException
>          at java.lang.Throwable.printStackTrace(Throwable.java:460)
>          at org.apache.hadoop.streaming.PipeMapRed$MROutputThread.run(PipeMapRed.java:352)
> {code}
> In PipeMapRed.java
> {code}
> 351       } catch (IOException io) {
> 352         io.printStackTrace(log_);
> 353         outerrThreadsThrowable = io;
> {code}
> I guess log_ is  Null... Should call logStackTrace.

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