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From "Matei Zaharia (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5154) 4-way deadlock in FairShare scheduler
Date Fri, 13 Feb 2009 07:21:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5154?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matei Zaharia updated HADOOP-5154:
----------------------------------

    Attachment: hadoop-5154-v1.patch

Here's a new patch taking into account Tom's comments. Tom, the reason I had moved the update
outside of the loop was because I thought I might want to acquire a lock on the JobTracker
in update later, which could cause a deadlock with assignTasks (which locks the JT and then
the scheduler), but now I think that this is not necessary so there's no reason to do it.

> 4-way deadlock in FairShare scheduler
> -------------------------------------
>
>                 Key: HADOOP-5154
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5154
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/fair-share
>            Reporter: Vinod K V
>         Attachments: FairSchedulerDeadLock.txt, hadoop-5154-v0.patch, hadoop-5154-v1.patch
>
>
> This happened while trying to change the priority of a job from the scheduler servlet.

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