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Posted to mapreduce-dev@hadoop.apache.org by "Radim Kolar (JIRA)" <ji...@apache.org> on 2012/12/06 15:57:09 UTC

[jira] [Created] (MAPREDUCE-4851) add lifecycle to Comparators

Radim Kolar created MAPREDUCE-4851:
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             Summary: 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


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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