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https://issues.apache.org/jira/browse/ZOOKEEPER-2938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16865427#comment-16865427
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Roland Johann commented on ZOOKEEPER-2938:
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I see this behavior at 3.4.14 as well. Restart the leader solves the issue
> Server is unable to join quorum after connection broken to other peers
> ----------------------------------------------------------------------
>
> Key: ZOOKEEPER-2938
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2938
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.4.6
> Reporter: Abhay Bothra
> Priority: Major
>
> We see the following logs in the node with {{myid: 1}}
> {code}
> 2017-11-08 15:06:28,375 [myid:1] - INFO
> [WorkerSender[myid=1]:QuorumCnxManager@193] - Have smaller server identifier,
> so dropping the connection: (2, 1)
> 2017-11-08 15:06:28,375 [myid:1] - INFO
> [WorkerSender[myid=1]:QuorumCnxManager@193] - Have smaller server identifier,
> so dropping the connection: (3, 1)
> 2017-11-08 15:07:28,375 [myid:1] - INFO
> [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message
> format version), 1 (n.leader), 0x28e000a8750 (n.zxid), 0x1 (n.round), LOOKING
> (n.state), 1 (n.sid), 0x28e (n.peerEpoch) LOOKING (my state)
> 2017-11-08 15:07:28,375 [myid:1] - INFO
> [WorkerSender[myid=1]:QuorumCnxManager@193] - Have smaller server identifier,
> so dropping the connection: (2, 1)
> 2017-11-08 15:07:28,376 [myid:1] - INFO
> [WorkerSender[myid=1]:QuorumCnxManager@193] - Have smaller server identifier,
> so dropping the connection: (3, 1)
> 2017-11-08 15:08:28,375 [myid:1] - INFO
> [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message
> format version), 1 (n.leader), 0x28e000a8750 (n.zxid), 0x1 (n.round), LOOKING
> (n.state), 1 (n.sid), 0x28e (n.peerEpoch) LOOKING (my state)
> 2017-11-08 15:08:28,376 [myid:1] - INFO
> [WorkerSender[myid=1]:QuorumCnxManager@193] - Have smaller server identifier,
> so dropping the connection: (2, 1)
> 2017-11-08 15:08:28,376 [myid:1] - INFO
> [WorkerSender[myid=1]:QuorumCnxManager@193] - Have smaller server identifier,
> so dropping the connection: (3, 1)
> 2017-11-08 15:09:28,376 [myid:1] - INFO
> [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message
> format version), 1 (n.leader), 0x28e000a8750 (n.zxid), 0x1 (n.round), LOOKING
> (n.state), 1 (n.sid), 0x28e (n.peerEpoch) LOOKING (my state)
> 2017-11-08 15:09:28,376 [myid:1] - INFO
> [WorkerSender[myid=1]:QuorumCnxManager@193] - Have smaller server identifier,
> so dropping the connection: (2, 1)
> 2017-11-08 15:09:28,376 [myid:1] - INFO
> [WorkerSender[myid=1]:QuorumCnxManager@193] - Have smaller server identifier,
> so dropping the connection: (3, 1)
> 2017-11-08 15:10:28,376 [myid:1] - INFO
> [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message
> format version), 1 (n.leader), 0x28e000a8750 (n.zxid), 0x1 (n.round), LOOKING
> (n.state), 1 (n.sid), 0x28e (n.peerEpoch) LOOKING (my state)
> 2017-11-08 15:10:28,376 [myid:1] - INFO
> [WorkerSender[myid=1]:QuorumCnxManager@193] - Have smaller server identifier,
> so dropping the connection: (2, 1)
> 2017-11-08 15:10:28,377 [myid:1] - INFO
> [WorkerSender[myid=1]:QuorumCnxManager@193] - Have smaller server identifier,
> so dropping the connection: (3, 1)
> {code}
> On the nodes with {{myid: 2}} and {{myid: 3}}, we see connection broken
> events for {{myid: 1}}
> {code}
> 2017-11-07 02:54:32,135 [myid:2] - WARN
> [RecvWorker:1:QuorumCnxManager$RecvWorker@780] - Connection broken for id 1,
> my id = 2, error =
> java.net.SocketException: Connection reset
> at java.net.SocketInputStream.read(SocketInputStream.java:209)
> at java.net.SocketInputStream.read(SocketInputStream.java:141)
> at java.net.SocketInputStream.read(SocketInputStream.java:223)
> at java.io.DataInputStream.readInt(DataInputStream.java:387)
> at
> org.apache.zookeeper.server.quorum.QuorumCnxManager$RecvWorker.run(QuorumCnxManager.java:765)
> 2017-11-07 02:54:32,135 [myid:2] - WARN
> [RecvWorker:1:QuorumCnxManager$RecvWorker@783] - Interrupting SendWorker
> 2017-11-07 02:54:32,135 [myid:2] - WARN
> [SendWorker:1:QuorumCnxManager$SendWorker@697] - Interrupted while waiting
> for message on queue
> java.lang.InterruptedException
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:2014)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2088)
> at
> java.util.concurrent.ArrayBlockingQueue.poll(ArrayBlockingQueue.java:418)
> at
> org.apache.zookeeper.server.quorum.QuorumCnxManager.pollSendQueue(QuorumCnxManager.java:849)
> at
> org.apache.zookeeper.server.quorum.QuorumCnxManager.access$500(QuorumCnxManager.java:64)
> at
> org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.run(QuorumCnxManager.java:685)
> 2017-11-07 02:54:32,135 [myid:2] - WARN
> [SendWorker:1:QuorumCnxManager$SendWorker@706] - Send worker leaving thread
> {code}
> From the reported occurrences, it looks like this is a problem only when the
> node with the smallest {{myid}} loses connection.
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