Chia-Ping Tsai created KAFKA-17152:
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             Summary: Make sure zk session tracker gets down when closing 
embedded zk
                 Key: KAFKA-17152
                 URL: https://issues.apache.org/jira/browse/KAFKA-17152
             Project: Kafka
          Issue Type: Sub-task
            Reporter: Chia-Ping Tsai
            Assignee: Chia-Ping Tsai


zk `SessionTrackerImpl`[0] exits the loop on background, and hence it can keep 
alive for a while after zk shutdown. We should have a small waiting for it when 
closing `EmbeddedZookeeper` [1]


[0] 
https://github.com/apache/zookeeper/blob/master/zookeeper-server/src/main/java/org/apache/zookeeper/server/SessionTrackerImpl.java#L158
[1] 
https://github.com/apache/kafka/blob/trunk/core/src/test/scala/unit/kafka/zk/EmbeddedZookeeper.scala#L53



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