A. Sophie Blee-Goldman created KAFKA-12936:
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Summary: In-memory stores are always restored from scratch after
dropping out of the group
Key: KAFKA-12936
URL: https://issues.apache.org/jira/browse/KAFKA-12936
Project: Kafka
Issue Type: Bug
Components: streams
Reporter: A. Sophie Blee-Goldman
Whenever an in-memory store is closed, the actual store contents are garbage
collected and the state will need to be restored from scratch if the task is
reassigned and re-initialized. We introduced the recycling feature to prevent
this from occurring when a task is transitioned from standby to active (or vice
versa), but it's still possible for the in-memory state to be unnecessarily
wiped out in the case the member has dropped out of the group. In this case,
the onPartitionsLost callback is invoked, which will close all active tasks as
dirty before the member rejoins the group. This means that all these tasks will
need to be restored from scratch if they are reassigned back to this consumer.
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