Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/19856
>I think the log can't reflect the behavior of consumer connection,because
consumer.create doesn't do any connect,it only construct a
ZookeeperConsumerConnector instance
That's not true, `ZookeeperConsumerConnector` will also connect to ZK
during initialization, please see here
(https://github.com/apache/kafka/blob/c9f930e3fe25e5675e64550c8b396356c5349ca7/core/src/main/scala/kafka/consumer/ZookeeperConsumerConnector.scala#L126).
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