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From "Bikas Saha (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3899) Locking not correct in org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService.allocate(AllocateRequest request)
Date Fri, 24 Feb 2012 19:09:48 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bikas Saha updated MAPREDUCE-3899:
----------------------------------

    Status: Patch Available  (was: Open)
    
> Locking not correct in org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService.allocate(AllocateRequest
request)
> -------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3899
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3899
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2, resourcemanager
>    Affects Versions: 0.23.0
>            Reporter: Bikas Saha
>            Assignee: Bikas Saha
>             Fix For: 0.23.0
>
>         Attachments: MAPREDUCE-3899-branch-0.23.patch
>
>
> Looks like the lock taken in this is broken. It takes a lock on lastResponse object and
then puts a new lastResponse object into the map. At this point a new thread entering this
function will get a new lastResponse object and will be able to take its lock and enter the
critical section. Presumably we want to limit one response per app attempt. So the lock could
be taken on the ApplicationAttemptId key of the response map object.

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