Guozhang Wang updated KAFKA-4163:
    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

Issue resolved by pull request 1845

> NPE in StreamsMetadataState during re-balance operations
> --------------------------------------------------------
>                 Key: KAFKA-4163
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4163
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions:
>            Reporter: Damian Guy
>            Assignee: Damian Guy
>             Fix For:
> During rebalance operations it is possible that an NPE can be thrown on 
> StreamsMetadataState operations. We should first check it the Cluster object 
> is non-empty. If it is empty we should return StreamsMetadata.NOT_AVAILABLE.
> Also, we should tidy up InvalidStateStoreException messages in the store API 
> to suggest that the store may have migrated to another instance

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