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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3837) hadop streaming does not use progress reporting to detect hung tasks
Date Tue, 21 Oct 2008 22:40:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3837?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Chansler updated HADOOP-3837:
------------------------------------

    Release Note: Changed streaming tasks to adhere to task timeout value specified in the
job configuration.  (was: Streaming tasks adhere to task timeout value specified in the job
configuration.)

> hadop streaming does not use progress reporting to detect hung tasks
> --------------------------------------------------------------------
>
>                 Key: HADOOP-3837
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3837
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/streaming
>    Affects Versions: 0.17.0
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>             Fix For: 0.18.0, 0.19.0
>
>         Attachments: streamTimeout.patch, streamTimeout.patch
>
>
> Hadoop streaming (StreamJob.java) sets mapred.task.timeout to 0. This effectively means
that if tasks hang (either due to bad user code or machine related issue), these tasks never
encounters a timeout. This causes the entire job to hang.
> I propose that hadoop streaming not set the timeout to 0. By default, the settings in
hadoop-default.xml should be effective for streaming jobs.

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