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https://issues.apache.org/jira/browse/IMPALA-13130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Smith resolved IMPALA-13130.
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Fix Version/s: Impala 4.5.0
Resolution: Fixed
> Under heavy load, Impala does not prioritize data stream operations
> -------------------------------------------------------------------
>
> Key: IMPALA-13130
> URL: https://issues.apache.org/jira/browse/IMPALA-13130
> Project: IMPALA
> Issue Type: Bug
> Reporter: Michael Smith
> Assignee: Michael Smith
> Priority: Major
> Fix For: Impala 4.5.0
>
>
> Under heavy load - where Impala reaches max memory for the DataStreamService
> and applies backpressure via
> https://github.com/apache/impala/blob/4.4.0/be/src/rpc/impala-service-pool.cc#L191-L199
> - DataStreamService does not differentiate between types of requests and may
> reject requests that could help reduce load.
> The DataStreamService deals with TransmitData, PublishFilter, UpdateFilter,
> UpdateFilterFromRemote, and EndDataStream. It seems like we should prioritize
> completing EndDataStream, especially under heavy load, to complete work and
> release resources more quickly.
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