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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4230) Ensure framework counter group synchronization is correct for serialization/deserialization
Date Mon, 07 May 2012 19:14:47 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269903#comment-13269903
] 

Tom White commented on MAPREDUCE-4230:
--------------------------------------

The general pattern is to use a combination of intrinsic locks for updating counters and the
Writable readFields/write methods, and Java's weakly consistent collections for views (e.g.
iterators).
                
> Ensure framework counter group synchronization is correct for serialization/deserialization
> -------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4230
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4230
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Tom White
>             Fix For: 2.0.0
>
>
> FrameworkCounterGroup and FileSystemCounterGroup may be susceptible to a race outlined
in https://issues.apache.org/jira/browse/MAPREDUCE-4226?focusedCommentId=13269657&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13269657
by Robert Joseph Evans.

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