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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1965) Handle map output buffers better
Date Wed, 31 Oct 2007 18:23:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539142
] 

Hadoop QA commented on HADOOP-1965:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
http://issues.apache.org/jira/secure/attachment/12368774/HADOOP-1965-1.patch
against trunk revision r590273.

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

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

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

    findbugs -1.  The patch appears to introduce 5 new Findbugs warnings.

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

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

Test results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1040/testReport/
Findbugs warnings: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1040/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1040/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1040/console

This message is automatically generated.

> Handle map output buffers better
> --------------------------------
>
>                 Key: HADOOP-1965
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1965
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.16.0
>            Reporter: Devaraj Das
>            Assignee: Amar Kamat
>             Fix For: 0.16.0
>
>         Attachments: 1965_single_proc_150mb_gziped.jpeg, 1965_single_proc_150mb_gziped.pdf,
1965_single_proc_150mb_gziped_breakup.png, HADOOP-1965-1.patch
>
>
> Today, the map task stops calling the map method while sort/spill is using the (single
instance of) map output buffer. One improvement that can be done to improve performance of
the map task is to have another buffer for writing the map outputs to, while sort/spill is
using the first buffer.

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