Drawxy created KAFKA-16218:
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Summary: Partition reassignment can't complete if any target
replica is out-of-sync
Key: KAFKA-16218
URL: https://issues.apache.org/jira/browse/KAFKA-16218
Project: Kafka
Issue Type: Bug
Reporter: Drawxy
Assumed that there were 4 brokers (1001,2001,3001,4001) and a topic partition
_foo-0_ (replicas[1001,2001,3001], isr[1001,3001]). The replica 2001 can't
catch up and become out-of-sync due to some issue.
If we launch a partition reassinment for this _foo-0_ (the target replica list
is [1001,2001,4001]), the partition reassignment can't complete even if the
adding replica 4001 already catches up. At that time, the partition state would
be replicas[1001,2001,4001,3001] isr[1001,3001,4001].
The out-of-sync replica 2001 shouldn't make the partition reassignment stuck.
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