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Sam An commented on ZOOKEEPER-2938: ----------------------------------- [~RAbreu], I double checked. My problem happens most likely due to my Kube cluster's network security. By default, communication between pods are denied. I will try set up proper network policy and retry and update this Jira if finding otherwise. > 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, 3.4.14 > 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. -- This message was sent by Atlassian Jira (v8.3.4#803005)