Riza Suminto created IMPALA-12300:
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Summary: Turn Scheduler::CheckEffectiveInstanceCount to print
warning
Key: IMPALA-12300
URL: https://issues.apache.org/jira/browse/IMPALA-12300
Project: IMPALA
Issue Type: Improvement
Reporter: Riza Suminto
Assignee: Riza Suminto
Scheduler::CheckEffectiveInstanceCount was added to check consistency between
FE planning and BE scheduling if COMPUTE_PROCESSING_COST=true. This consistency
can be broken if there is a cluster membership change (new executor becomes
online) between FE planning and BE scheduling. Say, in executor group size 10
with 90% health threshold, admission-controller is allowed to run a query when
only 9 executor is available. If 10th executor is online during BE scheduling,
CheckEffectiveInstanceCount can fail and return error.
It should be OK to turn this error form CheckEffectiveInstanceCount into
warning since query plan for fewer executor should generally OK to run in
larger executor group size.
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