kafka关注的issue

BrokerChangeListener computes inconsistent live/dead broker list
https://issues.apache.org/jira/browse/KAFKA-3085 BrokerChangeListener missed broker id path ephemeral node deletion event.
https://issues.apache.org/jira/browse/KAFKA-2448 Controller could miss a broker state change
https://issues.apache.org/jira/browse/KAFKA-1120