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Posted to mapreduce-issues@hadoop.apache.org by "Dave Latham (JIRA)" <ji...@apache.org> on 2015/07/03 00:05:06 UTC
[jira] [Commented] (MAPREDUCE-5221) Reduce side Combiner is not
used when using the new API
[ https://issues.apache.org/jira/browse/MAPREDUCE-5221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14612605#comment-14612605 ]
Dave Latham commented on MAPREDUCE-5221:
----------------------------------------
Looks like this was never committed and left to rot. Any reason it didn't make it? If we refresh it can we get it committed?
> Reduce side Combiner is not used when using the new API
> -------------------------------------------------------
>
> Key: MAPREDUCE-5221
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5221
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.0.4-alpha
> Reporter: Siddharth Seth
> Assignee: Tsuyoshi Ozawa
> Labels: BB2015-05-TBR
> Attachments: MAPREDUCE-5221.1.patch, MAPREDUCE-5221.10.patch, MAPREDUCE-5221.2.patch, MAPREDUCE-5221.3.patch, MAPREDUCE-5221.4.patch, MAPREDUCE-5221.5.patch, MAPREDUCE-5221.6.patch, MAPREDUCE-5221.7-2.patch, MAPREDUCE-5221.7.patch, MAPREDUCE-5221.8.patch, MAPREDUCE-5221.9.patch
>
>
> If a combiner is specified using o.a.h.mapreduce.Job.setCombinerClass - this will silently ignored on the reduce side since the reduce side usage is only aware of the old api combiner.
> This doesn't fail the job - since the new combiner key does not deprecate the old key.
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