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Date: Mon, 9 Apr 2007 21:43:32 -0700 (PDT)
From: "Runping Qi (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-1154) streaming hang.
 (PipeMapRed$MROutputThread gone)
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    [ https://issues.apache.org/jira/browse/HADOOP-1154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12487682 ] 

Runping Qi commented on HADOOP-1154:
------------------------------------

+1

It is reasonable to fail a streaming task if its the threads readingfrom/writing to the streaming process fails.


> streaming hang. (PipeMapRed$MROutputThread gone)
> ------------------------------------------------
>
>                 Key: HADOOP-1154
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1154
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/streaming
>            Reporter: Koji Noguchi
>         Assigned To: Koji Noguchi
>         Attachments: 1154.patch, PipeReducer.jstack
>
>
> One streaming reducer ('cat')  hang, 
>  '/bin/cat' reducer waiting in 
>     0 S _____  24587 24557  0  75   0 -   631 pipe_w Mar22 ?        00:00:02 /bin/cat
> strace showed that it's waiting in write.
> $ strace -p 24587
> Process 24587 attached - interrupt to quit
> write(1, "________  "..., 138 <unfinished ...>
> Process 24587 detached
> When I looked at the jstack of ReduceTask process, I couldn't find the PipeMapRed$MROutputThread.

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