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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5154) 4-way deadlock in FairShare scheduler
Date Tue, 24 Feb 2009 09:04:02 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12676220#action_12676220
] 

Hemanth Yamijala commented on HADOOP-5154:
------------------------------------------

Matei, this looks good. Thanks for the changes. 

I made one small change to make access to the useFifo variable also synchronized, and uploaded
a patch with this change alone. All other changes are from your patch. (I took this liberty
because we are just trying to stabilize the 0.20 release soon, and would very much like this
patch into the branch ASAP.) I verified that changes to the scheduling mode from the web ui
is working with this change. If you are fine with these changes, I think it is good to go.

> 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
>            Assignee: Matei Zaharia
>            Priority: Blocker
>             Fix For: 0.19.2, 0.20.0
>
>         Attachments: FairSchedulerDeadLock.txt, hadoop-5154-v0.patch, hadoop-5154-v1.patch,
hadoop-5154-v2.patch, hadoop-5154-v3.patch, hadoop-5154-v4.patch, hadoop-5154-v5.patch
>
>
> This happened while trying to change the priority of a job from the scheduler servlet.

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