Calvin Liu created KAFKA-18042:
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Summary: Reject the produce request with lower producer epoch
early.
Key: KAFKA-18042
URL: https://issues.apache.org/jira/browse/KAFKA-18042
Project: Kafka
Issue Type: Sub-task
Reporter: Calvin Liu
With the transaction V2, replica manager checks whether the incoming producer
request produces to a partition belonging to a transaction. ReplicaManager
figures this out by checking the producer epoch stored in the partition log.
However, the current code does not reject the produce request if its producer
epoch is lower than the stored producer epoch. It is an optimization to reject
such requests earlier instead of sending an AddPartitionToTxn request and
getting rejected in the response.
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