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  • KIP-216: IQ should throw different exceptions for different errors
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Working In Process


Current state[One of "Under Discussion", "Accepted", "Rejected"]

Discussion thread: here

JIRA KAFKA-5876 - Getting issue details... STATUS

Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).


As the moment the IQ is only thrown InvalidStateStoreException for all errors. That means the user cannot handle different types of errors. We should throw different exceptions for different types.

Proposed Changes

Add two new exception class for the IQ state store errors:

  • public class StateStoreMigratedException extends InvalidStateStoreException
  • public class StateStoreClosedException extends InvalidStateStoreException

StateStoreMigratedException used for state store not available and may have been migrated to another instance, the user needs re-discovering its location.

StateStoreClosedException used for state store is closed.(RocksDBStore, WrappedStateStore)

Compatibility, Deprecation, and Migration Plan

  • Because no classes will be removed, this change will be fully backward.

Rejected Alternatives


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