David Mao created KAFKA-16121:
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Summary: Partition reassignments in ZK migration dual write mode
stalled until leader epoch incremented
Key: KAFKA-16121
URL: https://issues.apache.org/jira/browse/KAFKA-16121
Project: Kafka
Issue Type: Bug
Reporter: David Mao
I noticed this in an integration test in
https://github.com/apache/kafka/pull/15184
In ZK mode, partition leaders rely on the LeaderAndIsr request to be notified
of new replicas as part of a reassignment. In ZK mode, we ignore any
LeaderAndIsr request where the partition leader epoch is less than or equal to
the current partition leader epoch.
In KRaft mode, we do not bump the leader epoch when starting a new
reassignment, see: `triggerLeaderEpochBumpIfNeeded`. This means that the leader
will ignore the LISR request initiating the reassignment until a leader epoch
bump is triggered through another means, for instance preferred leader election.
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