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https://issues.apache.org/jira/browse/HIVE-20203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16554809#comment-16554809
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Eric Wohlstadter commented on HIVE-20203:
-----------------------------------------
[~teddy.choi]
I think this should be ok to commit now.
> Arrow SerDe leaks a DirectByteBuffer
> ------------------------------------
>
> Key: HIVE-20203
> URL: https://issues.apache.org/jira/browse/HIVE-20203
> Project: Hive
> Issue Type: Bug
> Reporter: Eric Wohlstadter
> Assignee: Eric Wohlstadter
> Priority: Blocker
> Attachments: HIVE-20203.1.patch, HIVE-20203.2.patch,
> HIVE-20203.3.patch, HIVE-20203.4.patch
>
>
> ArrowColumnarBatchSerDe allocates an arrow NullableMapVector for each task
> that uses the serde.
> The vector is a DirectByteBuffer allocated from Arrow's off-heap buffer pool.
> This buffer is never closed and leaks about 1K of physical memory for each
> task.
> This patch does three things:
> # Ensure the buffer is closed when the RecordWriter for the task is closed.
> # Adds per-task memory accounting by assigning a ChildAllocator to each task
> from the RootAllocator.
> # Enforces that the ChildAllocator for a task has released all memory
> assigned to it, when the task is completed.
> The patch assumes that close() is always called on the RecordWriter when a
> task is finished (even if there is a failure during task execution).
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