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https://issues.apache.org/jira/browse/IMPALA-7446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16729761#comment-16729761
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Tim Armstrong commented on IMPALA-7446:
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I split out one of the issues I identified into a separate JIRA. I think that
one is both less impactful and harder to fix, so this JIRA can track fixing the
more impactful and easier issue of allocations failing because of cached memory
in the buffer pool.
> Queries can spill earlier than necessary because of accumulation of free
> buffers and clean pages
> ------------------------------------------------------------------------------------------------
>
> Key: IMPALA-7446
> URL: https://issues.apache.org/jira/browse/IMPALA-7446
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 2.10.0, Impala 2.11.0, Impala 3.0, Impala 2.12.0
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Critical
> Labels: resource-management
>
> See IMPALA-7442 for an example where the query started to spill even when
> memory could have been made available by freeing buffers or evicting clean
> pages. Usually this would just result in spilling earlier than necessary, but
> in the case of IMPALA-7442 it lead to a query failure.
> My original intent was that BufferPool::ReleaseMemory() should be called in
> situations like this, but that was not done.
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