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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-2224) Synchronization bugs in JvmManager
Date Sun, 19 Dec 2010 06:10:02 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated MAPREDUCE-2224:
-----------------------------------

    Attachment: mapreduce-2224.txt

Updated patch for trunk to include unit test. Also I had missed one synchronization case which
the test found.

> Synchronization bugs in JvmManager
> ----------------------------------
>
>                 Key: MAPREDUCE-2224
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2224
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: 0.22.0
>
>         Attachments: mapreduce-2224-cdh3.txt, mapreduce-2224.txt, mapreduce-2224.txt
>
>
> JvmManager.JvmManagerForType has several HashMap members that are inconsistently synchronized.
I've seen sporadic NPEs in the 0.20 version of this code which has similar bugs.

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