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Date: Fri, 11 Mar 2011 19:51:59 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] Commented: (HADOOP-7183) WritableComparator.get should not
 cache comparator objects
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    [ https://issues.apache.org/jira/browse/HADOOP-7183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005803#comment-13005803 ] 

Hadoop QA commented on HADOOP-7183:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12473422/HADOOP-7183.patch
  against trunk revision 1080723.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/308//testReport/
Findbugs warnings: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/308//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/308//console

This message is automatically generated.

> WritableComparator.get should not cache comparator objects
> ----------------------------------------------------------
>
>                 Key: HADOOP-7183
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7183
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Tom White
>            Priority: Blocker
>             Fix For: 0.20.3, 0.21.1, 0.22.0
>
>         Attachments: HADOOP-7183.patch
>
>
> HADOOP-6881 modified WritableComparator.get such that the constructed WritableComparator gets saved back into the static map. This is fine for stateless comparators, but some comparators have per-instance state, and thus this becomes thread-unsafe and causes errors in the shuffle where multiple threads are doing comparisons. An example of a Comparator with per-instance state is WritableComparator itself.

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