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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7747) Import tools should use a combiner to merge Puts
Date Tue, 26 Feb 2013 22:26:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13587663#comment-13587663
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Nick Dimiduk commented on HBASE-7747:
-------------------------------------

I could, but what would that maximum number be? Should it be fixed at some number? Should
it sniff the Runtime for heap size? This seems like a pretty arcane configuration point.

I'd prefer to re-tool other parts of the MR plumbing such that buffering the puts is unnecessary.
                
> Import tools should use a combiner to merge Puts
> ------------------------------------------------
>
>                 Key: HBASE-7747
>                 URL: https://issues.apache.org/jira/browse/HBASE-7747
>             Project: HBase
>          Issue Type: Improvement
>          Components: mapreduce, Performance
>            Reporter: Nick Dimiduk
>            Assignee: Nick Dimiduk
>            Priority: Minor
>             Fix For: 0.95.0
>
>         Attachments: 0001-HBASE-7747-Import-use-a-Put-combiner-where-possible.patch
>
>
> Multiple Puts to the same row should be combined into a single mutation object. This
can be done with a Combiner. Import.Importer#writeResult appears to do this manually.

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