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Date: Fri, 22 Aug 2014 14:06:13 +0000 (UTC)
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Subject: [jira] [Commented] (MAPREDUCE-5974) Allow specifying multiple
 MapOutputCollectors with fallback
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-5974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14106854#comment-14106854 ] 

Hudson commented on MAPREDUCE-5974:
-----------------------------------

SUCCESS: Integrated in Hadoop-Hdfs-trunk #1845 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1845/])
MAPREDUCE-5974. Allow specifying multiple MapOutputCollectors with fallback. (Todd Lipcon via kasha) (kasha: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1619492)
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/MapTask.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/site/apt/PluggableShuffleAndPluggableSort.apt.vm


> Allow specifying multiple MapOutputCollectors with fallback
> -----------------------------------------------------------
>
>                 Key: MAPREDUCE-5974
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5974
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: task
>    Affects Versions: 2.6.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 2.6.0
>
>         Attachments: mapreduce-5974.txt
>
>
> Currently we only allow specifying a single MapOutputCollector implementation class in a job. It would be nice to allow a comma-separated list of classes: we should try each collector implementation in the user-specified order until we find one that can be successfully instantiated and initted.
> This is useful for cases where a particular optimized collector implementation cannot operate on all key/value types, or requires native code. The cluster administrator can configure the cluster to try to use the optimized collector and fall back to the default collector.


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