Jason Gustafson created KAFKA-9081:
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Summary: Loosen reassignment completion to handle existing URPs
Key: KAFKA-9081
URL: https://issues.apache.org/jira/browse/KAFKA-9081
Project: Kafka
Issue Type: Improvement
Reporter: Jason Gustafson
Assignee: Jason Gustafson
Currently a reassignment completes only when all target replicas have joined
the ISR. If a partition is already under-replicated when a reassignment begins,
then reassignment completion depends also on resolving the prior condition.
For example, suppose we have an assignment of (1, 2, 3) and the ISR is (1, 2).
If we reassign to (1, 3, 4), then reassignment will be blocked until 3 rejoins
the ISR. In particular, this means you cannot reassign a partition with an
offline replica unless the reassignment removes that replica.
I think we can loosen completion criteria for these cases. The purpose of the
reassignment state machine is really to bring the new replicas in sync and not
to resolve a pre-existing condition. Especially in cases where the URP is a
result of increased load from the reassignment, we want the completion to not
be delayed.
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