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From "Kevin Wilfong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-4157) ORC runs out of heap when writing
Date Wed, 13 Mar 2013 02:02:14 GMT

     [ https://issues.apache.org/jira/browse/HIVE-4157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kevin Wilfong updated HIVE-4157:
--------------------------------

    Status: Patch Available  (was: Open)
    
> 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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