[KAFKA-4163] NPE in StreamsMetadataState during re-balance operations

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.10.1.0
• Fix Version/s: 0.10.1.0
• Component/s: streams
• Assignee: Damian Guy
• Reporter: Damian Guy
• Created: 14/Sep/16 10:11
• Updated: 19/Sep/16 18:01
• Resolved: 19/Sep/16 18:01

Description

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

Issue Links

• links to: GitHub Pull Request #1845