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https://issues.apache.org/jira/browse/IMPALA-12057?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yida Wu resolved IMPALA-12057.
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Fix Version/s: Impala 5.0.0
Assignee: Yida Wu
Resolution: Fixed
> admissiond fails to admit queued queries if coordinator's membership id
> changes
> -------------------------------------------------------------------------------
>
> Key: IMPALA-12057
> URL: https://issues.apache.org/jira/browse/IMPALA-12057
> Project: IMPALA
> Issue Type: Bug
> Reporter: Abhishek Rawat
> Assignee: Yida Wu
> Priority: Critical
> Fix For: Impala 5.0.0
>
>
> If coordinator's subscription id changes (due to a restart or reconnection
> with statestored), admissiond has no way of knowing if the coordinator was
> briefly disconnected and is again part of the cluster and has the query state
> preserved or coordinator got restarted and doesn't know anything about the
> queued query.
> Ideally in such cases admissiond should learn from coordinator and
> statestored that the queued queries are still valid and the subscription id
> has changed so that admission controller can submit the queued queries.
> Untill we support that we should at least fail these queries immediately. The
> current behavior is that admission controller goes into an infinite loop
> waiting on these queued queries:
> {code:java}
> I0411 13:52:22.694419 67 admission-controller.cc:2206] Could not dequeue
> query id=c748095c589ccfb6:3819937100000000 reason: Coordinator not registered
> with the statestore.
> I0411 13:52:22.795398 67 admission-controller.cc:2206] Could not dequeue
> query id=c748095c589ccfb6:3819937100000000 reason: Coordinator not registered
> with the statestore.
> ....
> I0411 15:14:11.063143 67 admission-controller.cc:2206] Could not dequeue
> query id=c748095c589ccfb6:3819937100000000 reason: Coordinator not registered
> with the statestore.
> I0411 15:14:11.164698 67 admission-controller.cc:2206] Could not dequeue
> query id=c748095c589ccfb6:3819937100000000 reason: Coordinator not registered
> with the statestore. {code}
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