maoling commented on issue #863: ZOOKEEPER-3320: Leader election port stop listen when hostname unresolvable for some time URL: https://github.com/apache/zookeeper/pull/863#issuecomment-477893575 After extending the `ZooKeeperCriticalThread`, When `QuorumCnxManager.Listener `had failed in listening to the LE port（e.g that port had already been used),then ZooKeeperServer will shutdown and exit. this suitation which `QuorumCnxManager.Listener` had exited is not a fatal one,even though she cannot take part in the new leader election), the zkServer can still take server for read/write request.
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