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https://issues.apache.org/jira/browse/IMPALA-4179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17044036#comment-17044036
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Tim Armstrong commented on IMPALA-4179:
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IMPALA-9156 will probably add back in one or more instances of this.
> Remove RowBatch::MarkNeedsDeepCopy() memory management API
> ----------------------------------------------------------
>
> Key: IMPALA-4179
> URL: https://issues.apache.org/jira/browse/IMPALA-4179
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 2.8.0
> Reporter: Tim Armstrong
> Priority: Major
> Labels: resource-management
>
> We should remove this API as a simplification of the memory transfer model.
> It was used in various places to manage lifetime of BufferHandles, but those
> can be replaced with attaching the BufferHandle + MarkFlushResources().
> It is also used to work around the fact that some memory is never returned
> from ExecNodes and is freed in Close(). Part of the solution is probably to
> add a way to attach all resources to a RowBatch before Close() and during
> Reset().
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