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https://issues.apache.org/jira/browse/HIVE-4157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13600621#comment-13600621
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Kevin Wilfong commented on HIVE-4157:
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https://reviews.facebook.net/D9351
> 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
>
> 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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