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Posted to mapreduce-issues@hadoop.apache.org by "Radim Kolar (JIRA)" <ji...@apache.org> on 2012/12/06 19:47:09 UTC

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

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4851?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Radim Kolar updated MAPREDUCE-4851:
-----------------------------------

    Hadoop Flags:   (was: Incompatible change)
    
> 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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