Jason Gustafson created KAFKA-5186:
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Summary: Avoid expensive initialization of producer state when
upgrading
Key: KAFKA-5186
URL: https://issues.apache.org/jira/browse/KAFKA-5186
Project: Kafka
Issue Type: Sub-task
Reporter: Jason Gustafson
Assignee: Jason Gustafson
Priority: Critical
Currently the producer state is always loaded upon broker initialization. If we
don't find a snapshot file to load from, then we scan the log segments from the
beginning to rebuild the state. Of course, when users upgrade to the new
version, there will be no snapshot file, so the upgrade could be quite
intensive. It would be nice to avoid this by assuming instead that the absence
of a snapshot file means that the producer state should start clean and we can
avoid the expensive scanning.
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