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From "Gabriel Reid (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-212) Need target wrapper for HFileOuptutFormat
Date Sat, 08 Jun 2013 20:48:20 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13678850#comment-13678850
] 

Gabriel Reid commented on CRUNCH-212:
-------------------------------------

That's correct about the total ordering -- actually, I believe the util method in HFileOutputFormat
sets up a (total order) partitioner based on existing regions in the target HTable so that
the outputs match up with the regions. That's all based on Writables (HBase Puts or KeyValues),
and I think that it's probably pretty reusable by us (except that it excludes Avro, which
will be the case regardless).

There are a few other clever things that happen in the util methods of HFileOutputFormat,
and it will likely be a challenge to map those cleanly to Crunch -- however, I still really
think that this would be super-useful.
                
> Need target wrapper for HFileOuptutFormat
> -----------------------------------------
>
>                 Key: CRUNCH-212
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-212
>             Project: Crunch
>          Issue Type: Improvement
>          Components: IO
>            Reporter: Chao Shi
>
> I need to import data to hbase from MR. I found HFileOutputFormat is ~5x more efficient
than HTableOutputFormat. So maybe we need a target wrapper for it.
> Future more, is it possible to call HBase to load it automatically after HFiles are generated?

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