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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3104) MultithreadMapRunner keeps consuming records even if trheads are not available
Date Thu, 27 Mar 2008 18:47:24 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12582765#action_12582765
] 

Hadoop QA commented on HADOOP-3104:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
http://issues.apache.org/jira/secure/attachment/12378727/patch3104.txt
against trunk revision 619744.

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

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

    javadoc -1.  The javadoc tool appears to have generated 1 warning messages.

    javac +1.  The applied patch does not generate any new javac compiler warnings.

    release audit +1.  The applied patch does not generate any new release audit warnings.

    findbugs -1.  The patch appears to introduce 1 new Findbugs warnings.

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

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

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2079/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2079/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2079/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2079/console

This message is automatically generated.

> MultithreadMapRunner keeps consuming records even if trheads are not available
> ------------------------------------------------------------------------------
>
>                 Key: HADOOP-3104
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3104
>             Project: Hadoop Core
>          Issue Type: Bug
>    Affects Versions: 0.16.1
>         Environment: all
>            Reporter: Alejandro Abdelnur
>            Assignee: Alejandro Abdelnur
>            Priority: Critical
>             Fix For: 0.16.2
>
>         Attachments: patch3104.txt
>
>
> The ExecutorService execute() method does not block when there are not threads available,
it queues up the runnables until there are threads. 
> The problem is that all key/values are read and kept in memory for the task, with large
datasets this will create a OOM exception.
> Have to figure out how to use the execute in blocking fashion.

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