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https://issues.apache.org/jira/browse/IMPALA-11891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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YifanZhang updated IMPALA-11891:
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Fix Version/s: Impala 4.3.0
> Update executor group min size without restarting coordinators
> --------------------------------------------------------------
>
> Key: IMPALA-11891
> URL: https://issues.apache.org/jira/browse/IMPALA-11891
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 4.2.0
> Reporter: YifanZhang
> Assignee: YifanZhang
> Priority: Minor
> Fix For: Impala 4.3.0
>
>
> Currently, when updating an executor group's min size, we need to restart all
> executors in this executor group and all coordinators. Restarting
> coordinators will interrupt queries running on all executor groups.
> It is necessary to restart coordinators because executor groups will never be
> removed from a cluster during the lifetime of an impalad and inconsistent
> executor group configurations will be ignored when adding a new executor:
> [https://github.com/apache/impala/blob/c3ed44268838f4a00624e7e7fbf6e614f0a54a48/be/src/scheduling/executor-group.cc#L89-L93]
>
> We can improve this by removing empty/unused executor groups from the
> membership, and then new configurations of the same group names can be
> applied.
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