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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1070) Deadlock in FairSchedulerServlet
Date Wed, 07 Oct 2009 07:46:31 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated MAPREDUCE-1070:
-----------------------------------

    Attachment: mapreduce-1070-branch20.txt

Here's a patch against branch20 which fixes the issue (the dynamic analysis tool no longer
sees the potential deadlock).

I also changed the output to go into a ByteArrayOutputStream to keep the time slice during
which the JT lock is held as short as possible.

Patch against trunk and branch 21 coming soon.

> Deadlock in FairSchedulerServlet
> --------------------------------
>
>                 Key: MAPREDUCE-1070
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1070
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.20.1, 0.21.0, 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: deadlock.png, mapreduce-1070-branch20.txt
>
>
> FairSchedulerServlet can cause a deadlock with the JobTracker

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