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https://issues.apache.org/jira/browse/MAPREDUCE-4851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13536673#comment-13536673
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Luke Lu commented on MAPREDUCE-4851:
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You still haven't explained why lifecycle is needed for comparators? It seems
to me that you only need task level lifecycle, which should work with JVM reuse
as well.
> 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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