Jason Gustafson created KAFKA-13227:
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Summary: Cancel pending AlterIsr requests after receiving
LeaderAndIsr
Key: KAFKA-13227
URL: https://issues.apache.org/jira/browse/KAFKA-13227
Project: Kafka
Issue Type: Improvement
Reporter: Jason Gustafson
Currently we do not cancel pending AlterIsr requests after the state has been
updated through a LeaderAndIsr request received from the controller. This leads
to log messages such as this
{code}
[2021-08-23 18:12:47,317] WARN [Partition __transaction_state-32 broker=3]
Failed to enqueue ISR change state LeaderAndIsr(leader=3, leaderEpoch=3,
isUncleanLeader=false, isr=List(3, 1), zkVersion=3) for partition
__transaction_state-32 (kafka.cluster.Partition)
{code}
I think the only complication here is protecting against the AlterIsr callback
which is executed asynchronously. To address this, we can move the `zkVersion`
field into `IsrState`. When the callback is invoked, we can the existing state
against the response state to decide whether to apply the change.
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