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https://issues.apache.org/jira/browse/MAPREDUCE-5974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14105773#comment-14105773
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Hudson commented on MAPREDUCE-5974:
-----------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #6092 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/6092/])
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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