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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1154) streaming hang. (PipeMapRed$MROutputThread gone)
Date Wed, 18 Apr 2007 11:05:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489694
] 

Hadoop QA commented on HADOOP-1154:
-----------------------------------

Integrated in Hadoop-Nightly #61 (See http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/61/)

> 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
>             Fix For: 0.13.0
>
>         Attachments: 1154-2.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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