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https://issues.apache.org/jira/browse/KAFKA-12948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17363490#comment-17363490
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Rajini Sivaram commented on KAFKA-12948:
----------------------------------------
Yes, it was due to the changes from
[https://cwiki.apache.org/confluence/display/KAFKA/KIP-601%3A+Configurable+socket+connection+timeout+in+NetworkClient]
, which went into 2.7.
> NetworkClient.close(node) with node in connecting state makes NetworkClient
> unusable
> ------------------------------------------------------------------------------------
>
> Key: KAFKA-12948
> URL: https://issues.apache.org/jira/browse/KAFKA-12948
> Project: Kafka
> Issue Type: Bug
> Components: network
> Affects Versions: 2.8.0, 2.7.1
> Reporter: Rajini Sivaram
> Assignee: Rajini Sivaram
> Priority: Critical
> Fix For: 2.7.2, 2.8.1
>
>
> `NetworkClient.close(node)` closes the node and removes it from
> `ClusterConnectionStates.nodeState`, but not from
> `ClusterConnectionStates.connectingNodes`. Subsequent `NetworkClient.poll()`
> invocations throw IllegalStateException and this leaves the NetworkClient in
> an unusable state until the node is removed from connectionNodes or added to
> nodeState. We don't use `NetworkClient.close(node)` in clients, but we use it
> in clients started by brokers for replica fetcher and controller. Since
> brokers use NetworkClientUtils.isReady() before establishing connections and
> this invokes poll(), the NetworkClient never recovers.
> Exception stack trace:
> {code:java}
> java.lang.IllegalStateException: No entry found for connection 0
> at
> org.apache.kafka.clients.ClusterConnectionStates.nodeState(ClusterConnectionStates.java:409)
> at
> org.apache.kafka.clients.ClusterConnectionStates.isConnectionSetupTimeout(ClusterConnectionStates.java:446)
> at
> org.apache.kafka.clients.ClusterConnectionStates.lambda$nodesWithConnectionSetupTimeout$0(ClusterConnectionStates.java:458)
> at
> java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:174)
> at
> java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1553)
> at
> java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
> at
> java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
> at
> java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
> at
> java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at
> java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
> at
> org.apache.kafka.clients.ClusterConnectionStates.nodesWithConnectionSetupTimeout(ClusterConnectionStates.java:459)
> at
> org.apache.kafka.clients.NetworkClient.handleTimedOutConnections(NetworkClient.java:807)
> at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:564)
> at
> org.apache.kafka.clients.NetworkClientUtils.isReady(NetworkClientUtils.java:42)
> {code}
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