YifanZhang created IMPALA-11891:
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Summary: 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
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 inconsistent executor group
configurations will be ignored:
[https://github.com/apache/impala/blob/c3ed44268838f4a00624e7e7fbf6e614f0a54a48/be/src/scheduling/executor-group.cc#L90]
We can improve this by removing empty/unused executor groups from the cluster,
and then new configurations of the same group names can be applied.
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