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https://issues.apache.org/jira/browse/KAFKA-5453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17211395#comment-17211395
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Bill Bejeck commented on KAFKA-5453:
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No progress since the last release, I'm clearing the fix version field as part
of the 2.7.0 release process.
> Controller may miss requests sent to the broker when zk session timeout
> happens.
> --------------------------------------------------------------------------------
>
> Key: KAFKA-5453
> URL: https://issues.apache.org/jira/browse/KAFKA-5453
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.11.0.0
> Reporter: Jiangjie Qin
> Assignee: Viktor Somogyi-Vass
> Priority: Major
> Fix For: 2.7.0
>
>
> The issue I encountered was the following:
> 1. Partition reassignment was in progress, one replica of a partition is
> being reassigned from broker 1 to broker 2.
> 2. Controller received an ISR change notification which indicates broker 2
> has caught up.
> 3. Controller was sending StopReplicaRequest to broker 1.
> 4. Broker 1 zk session timeout occurs. Controller removed broker 1 from the
> cluster and cleaned up the queue. i.e. the StopReplicaRequest was removed
> from the ControllerChannelManager.
> 5. Broker 1 reconnected to zk and act as if it is still a follower replica of
> the partition.
> 6. Broker 1 will always receive exception from the leader because it is not
> in the replica list.
> Not sure what is the correct fix here. It seems that broke 1 in this case
> should ask the controller for the latest replica assignment.
> There are two related bugs:
> 1. when a {{NotAssignedReplicaException}} is thrown from
> {{Partition.updateReplicaLogReadResult()}}, the other partitions in the same
> request will failed to update the fetch timestamp and offset and thus also
> drop out of the ISR.
> 2. The {{NotAssignedReplicaException}} was not properly returned to the
> replicas, instead, a UnknownServerException is returned.
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