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Posted to dev@hive.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2013/03/28 22:49:15 UTC

[jira] [Commented] (HIVE-4248) Implement a memory manager for ORC

    [ https://issues.apache.org/jira/browse/HIVE-4248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616691#comment-13616691 ] 

Owen O'Malley commented on HIVE-4248:
-------------------------------------

This may result in ORC files with smaller stripes, but that seems far better than letting the users get out of memory exceptions.
                
> Implement a memory manager for ORC
> ----------------------------------
>
>                 Key: HIVE-4248
>                 URL: https://issues.apache.org/jira/browse/HIVE-4248
>             Project: Hive
>          Issue Type: New Feature
>          Components: Serializers/Deserializers
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>
> With the large default stripe size (256MB) and dynamic partitions, it is quite easy for users to run out of memory when writing ORC files. We probably need a solution that keeps track of the total number of concurrent ORC writers and divides the available heap space between them. 

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