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Posted to dev@hive.apache.org by "Ferdinand Xu (JIRA)" <ji...@apache.org> on 2014/11/12 08:18:33 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=14207758#comment-14207758 ] 

Ferdinand Xu commented on HIVE-7685:
------------------------------------

Hi,
I am afraid the file name extension ".ready" may not be able to trigger the hive qa CI test. Better change to "*.patch".

> 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
>         Attachments: 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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