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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3153) Release codecs and output streams between flushes of RCFile
Date Thu, 26 Jul 2012 21:01:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423464#comment-13423464
] 

Owen O'Malley commented on HIVE-3153:
-------------------------------------

I also wrote a test program that just writes to a large number of RCFile.Writers. With the
patch, I was able to use a lot more Writers before I ran out of memory in the process.
                
> 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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