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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HIVE-3153) Release codecs and output streams between flushes of RCFile
Date Tue, 31 Jul 2012 06:13:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425553#comment-13425553
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Ashutosh Chauhan edited comment on HIVE-3153 at 7/31/12 6:12 AM:
-----------------------------------------------------------------

Nopes, this doesn't change format of file in any way, thus no backward compatibility issue.
It enables lazy initialization of codecs from init() to flushRecords(), where they are actually
needed, thus decreasing the memory footprint. 
                
      was (Author: ashutoshc):
    Nopes, this doesn't change format of file in any way. It enables lazy initialization of
codecs from init() to flushRecords(), where they are actually needed, thus decreasing the
memory footprint. 
                  
> Release codecs and output streams between flushes of RCFile
> -----------------------------------------------------------
>
>                 Key: HIVE-3153
>                 URL: https://issues.apache.org/jira/browse/HIVE-3153
>             Project: Hive
>          Issue Type: Improvement
>          Components: Compression
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>         Attachments: hive-3153.patch
>
>
> Currently, RCFile writer holds a compression codec per a file and a compression output
stream per a column. Especially for queries that use dynamic partitions this quickly consumes
a lot of memory.
> I'd like flushRecords to get a codec from the pool and create the compression output
stream in flushRecords.

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