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https://issues.apache.org/jira/browse/IMPALA-2626?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-2626.
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Resolution: Duplicate
> In-flight queries fail when statestore comes back online.
> ---------------------------------------------------------
>
> Key: IMPALA-2626
> URL: https://issues.apache.org/jira/browse/IMPALA-2626
> Project: IMPALA
> Issue Type: Bug
> Components: Distributed Exec
> Affects Versions: Impala 2.3.0
> Reporter: Sailesh Mukil
> Assignee: Sailesh Mukil
> Priority: Minor
> Labels: chaosmonkey, statestore, usability
>
> During a session, if the statestore goes down, the impalads continue
> execution if they have enough metadata that they've already received from the
> statestore prior to it's failure.
> The impalads can continue execution without the statestore with the stale
> metadata that they posses. However, when the statestore comes back online,
> the first membership callback it makes to the impalad hosts, erases the
> "known_backends" list that the impalads have stored locally.
> Therefore, in-flight queries fail(sometimes without propagating the error to
> the shell -> IMPALA-1325).
> Solution:
> Do not erase the list of "known_backends" in each impalad until the
> statestore has a new list to provide to the impalads.
> _This bug was found during initial runs of ChaosMonkey on Impala._
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