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https://issues.apache.org/jira/browse/KAFKA-4163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504170#comment-15504170
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ASF GitHub Bot commented on KAFKA-4163:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/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: 0.10.1.0
> Reporter: Damian Guy
> Assignee: Damian Guy
> Fix For: 0.10.1.0
>
>
> 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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