[jira] [Created] (IMPALA-9151) Number of executors during planning needs to account for suspended executor groupa

["Lars Volker (Jira)" <ji...@apache.org>]

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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