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https://issues.apache.org/jira/browse/MAPREDUCE-239?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J resolved MAPREDUCE-239.
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Resolution: Won't Fix
I think this is pretty much covered by map and reduce speculative option
separation.
> Attribute to mark Mappers and Reducers as side-effect free
> ----------------------------------------------------------
>
> Key: MAPREDUCE-239
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-239
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Owen O'Malley
>
> There should be an annotation to mark Mapper and Reducer classes as
> side-effect free. This annotation could then be used to disable speculative
> execution for such classes. Furthermore, defining a class without the
> NoSideEffect attribute as a combiner would be a run-time error.
> @NoSideEffects
> class MyMapper extends MapReduceBase implements Mapper { ... }
> would declare that MyMapper may be run speculatively.
> @NoSideEffects
> class MyReducer extends MapReduceBase implements Reducer { ...}
> declares that MyReducer can be run speculative and as a combiner.
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