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https://issues.apache.org/jira/browse/IMPALA-9711?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-9711.
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Fix Version/s: Impala 4.0
Resolution: Fixed
> Incrementally compute averaged profile
> --------------------------------------
>
> Key: IMPALA-9711
> URL: https://issues.apache.org/jira/browse/IMPALA-9711
> Project: IMPALA
> Issue Type: Sub-task
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Major
> Fix For: Impala 4.0
>
>
> The parent showed that updating the averaged profile can take a bit of time
> and executes on the RPC handler of the fetch RPC. We should consider how to
> optimise this.
> I think the most impactful change, from the point of view of query latency,
> is to apply the profile updates when each instance finishes instead of doing
> the computation on the RPC handler.
> For IMPALA-9382, we also need the averaged profile to be kept up-to-date when
> the profile is accessed, because it will be the only part of the profile that
> is exposed to clients.
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