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https://issues.apache.org/jira/browse/IMPALA-7096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on IMPALA-7096 started by Tim Armstrong.
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> Ensure no memory limit exceeded regressions from IMPALA-4835 because of
> non-reserved memory
> -------------------------------------------------------------------------------------------
>
> Key: IMPALA-7096
> URL: https://issues.apache.org/jira/browse/IMPALA-7096
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 2.13.0, Impala 3.1.0
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Blocker
> Labels: resource-management
> Attachments: ScanConsumingMostMemory.txt
>
>
> IMPALA-7078 showed some cases where non-buffer memory could accumulate in the
> row batch queue and cause memory consumption problems.
> The decision for whether to spin up a scanner thread in IMPALA-4835
> implicitly assumes that buffer memory is the bulk of memory consumed by a
> scan, but there may be cases where that is not true and the previous
> heuristic would be more conservative about starting a scanner thread.
> We should investigate this further and figure out how to avoid it if there's
> an issue.
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