Lars Volker created IMPALA-8758:
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Summary: Misleading error message "Unknown executor group" during
cluster startup with dedicated coordinator
Key: IMPALA-8758
URL: https://issues.apache.org/jira/browse/IMPALA-8758
Project: IMPALA
Issue Type: Bug
Components: Backend
Affects Versions: Impala 3.3.0
Reporter: Lars Volker
During cluster startup the Scheduler will return an error until the local
backend has started up ("Local backend has not been registered in the cluster
membership"). Afterwards, it will assume that the default executor group
exists. However, if the coordinator is not also an executor (i.e. it is a
dedicated coordinator), then it will not actually create the default executor
group in cluster-membership-mgr.cc:256.
Queries are expected to fail in this scenario, but the error message should
certainly be improved to indicate that no executors could be found. For this
purpose, we should make sure that the default executor group gets created as
soon as the local backend has started, but keep it empty if it is not an
executor. Then we can warn in the scheduler that no executors have been
registered so far.
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