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Posted to dev@hive.apache.org by "Kevin Wilfong (JIRA)" <ji...@apache.org> on 2013/03/13 03:02:14 UTC
[jira] [Updated] (HIVE-4157) ORC runs out of heap when writing
[ 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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