[GitHub] [kafka] guozhangwang commented on pull request #8683: KAFKA-9893: Configurable TCP connection timeout and improve the initial metadata fetch

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guozhangwang commented on pull request #8683:
URL: https://github.com/apache/kafka/pull/8683#issuecomment-654585011


   @d8tltanc @rajinisivaram @dajac We observed some exception thrown from our soak with the following stack trace:
   
   ```
   java.util.ConcurrentModificationException
   	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445)
   	at java.util.HashMap$KeyIterator.next(HashMap.java:1469)
   	at org.apache.kafka.clients.NetworkClient.handleTimedOutConnections(NetworkClient.java:822)
   	at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:574)
   	at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:265)
   	at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:236)
   	at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:215)
   	at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.joinGroupIfNeeded(AbstractCoordinator.java:419)
   	at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:359)
   ```
   
   Seems related to this PR, could you take a look?


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