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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4221) Stripe-level merge for ORC files
Date Thu, 25 Apr 2013 00:41:14 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13641242#comment-13641242
] 

Phabricator commented on HIVE-4221:
-----------------------------------

sxyuan has commented on the revision "HIVE-4221 [jira] Stripe-level merge for ORC files
".

INLINE COMMENTS
  common/src/java/org/apache/hadoop/hive/conf/HiveConf.java:481-485 Will do.
  ql/src/java/org/apache/hadoop/hive/ql/io/merge/BlockMergeOutputFormat.java:33 Will do.
  ql/src/test/queries/clientpositive/orcfile_merge1.q:1 I think setting the max split size
to 100 should generate multiple splits despite the small input. I can check that a merge is
actually happening and add comments for the tests.
  ql/src/test/queries/clientpositive/orcfile_merge2.q:1 As above.

REVISION DETAIL
  https://reviews.facebook.net/D9759

To: kevinwilfong, omalley, sxyuan
Cc: JIRA

                
> Stripe-level merge for ORC files
> --------------------------------
>
>                 Key: HIVE-4221
>                 URL: https://issues.apache.org/jira/browse/HIVE-4221
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Samuel Yuan
>            Assignee: Samuel Yuan
>         Attachments: HIVE-4221.HIVE-4221.HIVE-4221.HIVE-4221.D9759.1.patch
>
>
> As with RC files, we would like to be able to merge ORC files efficiently by reading/writing
stripes without decompressing/recompressing them. This will be similar to the RC file merge,
except that footers will have to be updated with the stripe positions in the new file.

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