[jira] [Created] (KAFKA-13227) Cancel pending AlterIsr requests after receiving LeaderAndIsr

["Jason Gustafson (Jira)" <ji...@apache.org>]

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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