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Date: Thu, 28 Mar 2013 19:19:18 +0000 (UTC)
From: "Gang Tim Liu (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12636679.1363129842007.71304.1364498358187@arcas>
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References: <JIRA.12636679.1363129842007@arcas>
Subject: [jira] [Commented] (HIVE-4157) ORC runs out of heap when writing
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    [ https://issues.apache.org/jira/browse/HIVE-4157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616557#comment-13616557 ] 

Gang Tim Liu commented on HIVE-4157:
------------------------------------

+1
                
> ORC runs out of heap when writing
> ---------------------------------
>
>                 Key: HIVE-4157
>                 URL: https://issues.apache.org/jira/browse/HIVE-4157
>             Project: Hive
>          Issue Type: Improvement
>          Components: Serializers/Deserializers
>    Affects Versions: 0.11.0
>            Reporter: Kevin Wilfong
>            Assignee: Kevin Wilfong
>         Attachments: HIVE-4157.1.patch.txt
>
>
> The OutStream class used by the ORC file format seems to aggressively allocate memory for ByteBuffers and doesn't seem too eager to give it back.
> This causes issues with heap space, particularly when a wide tables/dynamic partitions are involved.
> As a first step to resolving this problem, the OutStream class can be modified to lazily allocate memory, and more actively make it available for garbage collection.
> Follow ups could include checking the amount of free memory as part of determining if a spill is needed.

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