Calvin Liu created KAFKA-19212:
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Summary: Fix ElectionWasClean method bug when partition
reassignment completes
Key: KAFKA-19212
URL: https://issues.apache.org/jira/browse/KAFKA-19212
Project: Kafka
Issue Type: Bug
Reporter: Calvin Liu
Assignee: Calvin Liu
Fix For: 4.1.0
The current ElectionWasClean checks if the new leader is in the previous ISR.
However, there is a corner case in the partition reassignment.
The partition reassignment can change the partition replicas. If the new
preferred leader (the first one in the new replicas) is the last one to join
ISR, this preferred leader will be elected in the same partition change.
For example:
In the previous state, the partition is
Leader: 0, Replicas (2,1,0), ISR (1,0), Adding(2), removing(0).
Then replica 2 joins the ISR. The new partition would be like:
Leader: 2, Replicas (2,1), ISR(1,2).
The new leader 2 is not in the previous ISR (1,0) but it is still a clean
election.
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