Lars Volker created IMPALA-9151:
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Summary: Number of executors during planning needs to account for
suspended executor groupa
Key: IMPALA-9151
URL: https://issues.apache.org/jira/browse/IMPALA-9151
Project: IMPALA
Issue Type: Bug
Components: Frontend
Reporter: Lars Volker
Assignee: Lars Volker
When configuring Impala with executor groups, the planner might see a
{{ExecutorMembershipSnapshot}} that has no executors in it. This can happen if
the first executor group has not started up yet, or if all executor groups have
been shutdown. If this happens, the planner will make sub-optimal decisions,
e.g. decide on a broadcast join vs a PHJ. In the former case, we should have a
configurable fallback cluster size to use during planning. In the latter case,
we should hang on to the last executor group size that we had observed.
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