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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3940) Reduce often attempts in memory merge with no work
Date Wed, 13 Aug 2008 15:44:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622256#action_12622256

Hadoop QA commented on HADOOP-3940:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 685425.

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

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    -1 javadoc.  The javadoc tool appears to have generated 1 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 warnings.

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

    -1 core tests.  The patch failed core unit tests.

    -1 contrib tests.  The patch failed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3058/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3058/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3058/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3058/console

This message is automatically generated.

> Reduce often attempts in memory merge with no work
> --------------------------------------------------
>                 Key: HADOOP-3940
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3940
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Chris Douglas
>            Priority: Minor
>         Attachments: 3940-0.patch
> ReduceTask.ReduceCopier.ShuffleRamManager initializes numRequiredMapOutputs to 0, so
one of the predicates in ShuffleRamManager::waitForDataToMerge, {{numPendingRequests <
numRequiredMapOutputs}}, is false until the first map output is fetched and false again after
the last map output is fetched. The InMemFSMergeThread thread will loop busily in this state.

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