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Posted to issues@hive.apache.org by "Shannon Ladymon (JIRA)" <ji...@apache.org> on 2015/08/19 01:14:45 UTC

[jira] [Commented] (HIVE-7685) Parquet memory manager

    [ https://issues.apache.org/jira/browse/HIVE-7685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14702156#comment-14702156 ] 

Shannon Ladymon commented on HIVE-7685:
---------------------------------------

HIVE-11598 addresses the general issue of adding more Parquet documentation to the Hive wiki.

> Parquet memory manager
> ----------------------
>
>                 Key: HIVE-7685
>                 URL: https://issues.apache.org/jira/browse/HIVE-7685
>             Project: Hive
>          Issue Type: Improvement
>          Components: Serializers/Deserializers
>            Reporter: Brock Noland
>            Assignee: Dong Chen
>              Labels: TODOC15
>             Fix For: 1.1.0
>
>         Attachments: HIVE-7685.1.patch, HIVE-7685.1.patch.ready, HIVE-7685.patch, HIVE-7685.patch.ready
>
>
> Similar to HIVE-4248, Parquet tries to write large very large "row groups". This causes Hive to run out of memory during dynamic partitions when a reducer may have many Parquet files open at a given time.
> As such, we should implement a memory manager which ensures that we don't run out of memory due to writing too many row groups within a single JVM.



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