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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 Thu, 28 Feb 2013 00:33:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13588964#comment-13588964
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Nick Dimiduk commented on HBASE-7747:
-------------------------------------

Right. The single biggest improvement I want to see in the MR tooling is a single code path.
That way we won't need multiple implementations of MR components for both KeyValue and Put,
we'll have no more {{if(KeyValue.class.equals(...))}} in HFileOutputFormat, and we can implement
things like secondary sort once. With secondary sort, the \*SortReducer are 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, 0.98.0
>
>         Attachments: 0001-HBASE-7747-Import-use-a-Put-combiner-where-possible.patch,
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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