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https://issues.apache.org/jira/browse/MAPREDUCE-4851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13511464#comment-13511464
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Radim Kolar commented on MAPREDUCE-4851:
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No, partitioner change is backward compatible. This is not. Also i am not
merging tickets because this will delay review process, which is slow enough
already. They do not depends on each other.
Use case for cleanup() method is in my case: to disconnect from transaction
manager, shutdown datagrid, shutdown spring context.
> add lifecycle to Comparators
> ----------------------------
>
> Key: MAPREDUCE-4851
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4851
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Radim Kolar
> Labels: mrv2
>
> current mapreduce api is using RawComparator interface in:
> setGroupingComparatorClass
> setSortComparatorClass
> This interface has no lifecycle support. I propose to change that methods to
> take argument new class implements RawComparator with setup and cleanup
> methods.
> This will leave existing code with RawComparator alone, Providing some
> backward compatibility.
> new class:
> class SortComparator implements RawComparator
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