[ 
https://issues.apache.org/jira/browse/ZOOKEEPER-4051?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Badai Aqrandista updated ZOOKEEPER-4051:
----------------------------------------
    Description: 
This Zookeeper ensemble has 5 nodes: node 1, 2, 3, 4 and 5. At the time, leader 
was node 4. The quorum consisted of node 3, 4 and 5. Node 1 and 2 kept 
disconnecting from node 4, so they never joined the quorum.

 

At 2020-12-08 14:10:23, lost its quorum. But this only occurred after node 3 
disconnected from node 4 multiple times. The disconnection message from node 3 
had occurred more for more than 12 hours prior to this (but no logs prior to 
that). But the quorum was not lost. Following is form node 4. It shows that 
when the quorum was lost, there were only 2 nodes left in the quorum: node 4 
and 5.

 

Note that all IP addresses are replaced with 0.0.0.0 to allow it to be included 
in this bug report.

 
{noformat}
[2020-12-08 14:10:20,702] INFO Notification: 2 (message format version), 2 
(n.leader), 0x503300000000 (n.zxid), 0x3c (n.round), LOOKING (n.state), 2 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:20,918] INFO Notification: 2 (message format version), 2 
(n.leader), 0x503300000000 (n.zxid), 0x3c (n.round), LOOKING (n.state), 2 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:21,045] INFO Received connection request 0.0.0.0:41966 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:21,056] INFO Notification: 2 (message format version), 2 
(n.leader), 0x503300000000 (n.zxid), 0x3d (n.round), LOOKING (n.state), 2 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:21,193] INFO Notification: 2 (message format version), 1 
(n.leader), 0x420400000004 (n.zxid), 0x3d (n.round), LOOKING (n.state), 1 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:21,193] INFO Notification: 2 (message format version), 1 
(n.leader), 0x420400000004 (n.zxid), 0x3d (n.round), LOOKING (n.state), 1 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:21,204] INFO Notification: 2 (message format version), 2 
(n.leader), 0x503300000000 (n.zxid), 0x3d (n.round), LOOKING (n.state), 1 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:22,180] INFO Received connection request 0.0.0.0:41970 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,181] WARN Connection broken for id 3, my id = 4, error =  
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
java.net.SocketException: Socket closed
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
        at java.net.SocketInputStream.read(SocketInputStream.java:171)
        at java.net.SocketInputStream.read(SocketInputStream.java:141)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
        at java.io.DataInputStream.readInt(DataInputStream.java:387)
        at 
org.apache.zookeeper.server.quorum.QuorumCnxManager$RecvWorker.run(QuorumCnxManager.java:1212)
[2020-12-08 14:10:22,181] WARN Interrupting SendWorker 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,182] ERROR Failed to send last message. Shutting down 
thread. (org.apache.zookeeper.server.quorum.QuorumCnxManager)
java.net.SocketException: Socket closed
        at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:118)
        at java.net.SocketOutputStream.write(SocketOutputStream.java:134)
        at java.io.DataOutputStream.writeInt(DataOutputStream.java:197)
        at 
org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.send(QuorumCnxManager.java:1088)
        at 
org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.run(QuorumCnxManager.java:1115)
[2020-12-08 14:10:22,182] WARN Send worker leaving thread  id 3 my id = 4 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,402] INFO Received connection request 0.0.0.0:41974 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,403] ERROR Failed to send last message. Shutting down 
thread. (org.apache.zookeeper.server.quorum.QuorumCnxManager)
java.net.SocketException: Socket closed
        at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:118)
        at java.net.SocketOutputStream.write(SocketOutputStream.java:134)
        at java.io.DataOutputStream.writeInt(DataOutputStream.java:197)
        at 
org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.send(QuorumCnxManager.java:1088)
        at 
org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.run(QuorumCnxManager.java:1115)
[2020-12-08 14:10:22,403] WARN Send worker leaving thread  id 3 my id = 4 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,404] WARN Interrupting SendWorker 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,829] INFO Received connection request 0.0.0.0:51666 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,830] WARN Send worker leaving thread  id 3 my id = 4 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,830] INFO Notification: 2 (message format version), 2 
(n.leader), 0x503300000000 (n.zxid), 0x3d (n.round), LOOKING (n.state), 3 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:22,975] INFO Notification: 2 (message format version), 2 
(n.leader), 0x503300000000 (n.zxid), 0x3d (n.round), LOOKING (n.state), 3 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:23,443] INFO Shutting down 
(org.apache.zookeeper.server.quorum.Leader)
[2020-12-08 14:10:23,443] INFO Shutdown called 
(org.apache.zookeeper.server.quorum.Leader)
 
java.lang.Exception: shutdown Leader! reason: Not sufficient followers synced, 
only synced with sids: [ [4, 5],[4, 5] ]
 
        at org.apache.zookeeper.server.quorum.Leader.shutdown(Leader.java:682)
 
        at org.apache.zookeeper.server.quorum.Leader.lead(Leader.java:662)
 
        at 
org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1266)
 
[2020-12-08 14:10:23,444] INFO exception while shutting down acceptor: 
java.net.SocketException: Socket closed 
(org.apache.zookeeper.server.quorum.Leader)
[2020-12-08 14:10:23,448] INFO shutting down 
(org.apache.zookeeper.server.ZooKeeperServer)
[2020-12-08 14:10:23,448] INFO Shutting down 
(org.apache.zookeeper.server.SessionTrackerImpl)
[2020-12-08 14:10:23,448] INFO Shutting down 
(org.apache.zookeeper.server.quorum.LeaderRequestProcessor)
[2020-12-08 14:10:23,449] INFO Shutting down 
(org.apache.zookeeper.server.PrepRequestProcessor)
[2020-12-08 14:10:23,449] INFO Shutting down 
(org.apache.zookeeper.server.quorum.ProposalRequestProcessor)
[2020-12-08 14:10:23,449] INFO Shutting down 
(org.apache.zookeeper.server.quorum.CommitProcessor)
[2020-12-08 14:10:23,449] INFO CommitProcessor exited loop! 
(org.apache.zookeeper.server.quorum.CommitProcessor)
[2020-12-08 14:10:23,449] INFO PrepRequestProcessor exited loop! 
(org.apache.zookeeper.server.PrepRequestProcessor)
[2020-12-08 14:10:23,455] INFO Shutting down 
(org.apache.zookeeper.server.quorum.Leader)
[2020-12-08 14:10:23,455] INFO shutdown of request processor complete 
(org.apache.zookeeper.server.FinalRequestProcessor)
[2020-12-08 14:10:23,455] INFO Shutting down 
(org.apache.zookeeper.server.SyncRequestProcessor)
[2020-12-08 14:10:23,455] INFO SyncRequestProcessor exited! 
(org.apache.zookeeper.server.SyncRequestProcessor)
[2020-12-08 14:10:23,530] WARN PeerState set to LOOKING 
(org.apache.zookeeper.server.quorum.QuorumPeer)
[2020-12-08 14:10:23,530] INFO LOOKING 
(org.apache.zookeeper.server.quorum.QuorumPeer)
[2020-12-08 14:10:23,531] WARN ******* GOODBYE /0.0.0.0:46138 ******** 
(org.apache.zookeeper.server.quorum.LearnerHandler)


{noformat}
 

  was:
This Zookeeper ensemble has 5 nodes: node 1, 2, 3, 4 and 5. At the time, leader 
was node 4. The quorum consisted of node 3, 4 and 5. Node 1 and 2 kept 
disconnecting from node 4, so they never joined the quorum.

 

At 2020-12-08 14:10:23, lost its quorum. But this only occurred after node 3 
disconnected from node 4 multiple times. The disconnection message from node 3 
had occurred more for more than 12 hours prior to this (but no logs prior to 
that). But the quorum was not lost. Following is form node 4. It shows that 
when the quorum was lost, there were only 2 nodes left in the quorum: node 4 
and 5.

 

 
{noformat}
[2020-12-08 14:10:20,702] INFO Notification: 2 (message format version), 2 
(n.leader), 0x503300000000 (n.zxid), 0x3c (n.round), LOOKING (n.state), 2 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:20,918] INFO Notification: 2 (message format version), 2 
(n.leader), 0x503300000000 (n.zxid), 0x3c (n.round), LOOKING (n.state), 2 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:21,045] INFO Received connection request 0.0.0.0:41966 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:21,056] INFO Notification: 2 (message format version), 2 
(n.leader), 0x503300000000 (n.zxid), 0x3d (n.round), LOOKING (n.state), 2 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:21,193] INFO Notification: 2 (message format version), 1 
(n.leader), 0x420400000004 (n.zxid), 0x3d (n.round), LOOKING (n.state), 1 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:21,193] INFO Notification: 2 (message format version), 1 
(n.leader), 0x420400000004 (n.zxid), 0x3d (n.round), LOOKING (n.state), 1 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:21,204] INFO Notification: 2 (message format version), 2 
(n.leader), 0x503300000000 (n.zxid), 0x3d (n.round), LOOKING (n.state), 1 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:22,180] INFO Received connection request 0.0.0.0:41970 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,181] WARN Connection broken for id 3, my id = 4, error =  
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
java.net.SocketException: Socket closed
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
        at java.net.SocketInputStream.read(SocketInputStream.java:171)
        at java.net.SocketInputStream.read(SocketInputStream.java:141)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
        at java.io.DataInputStream.readInt(DataInputStream.java:387)
        at 
org.apache.zookeeper.server.quorum.QuorumCnxManager$RecvWorker.run(QuorumCnxManager.java:1212)
[2020-12-08 14:10:22,181] WARN Interrupting SendWorker 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,182] ERROR Failed to send last message. Shutting down 
thread. (org.apache.zookeeper.server.quorum.QuorumCnxManager)
java.net.SocketException: Socket closed
        at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:118)
        at java.net.SocketOutputStream.write(SocketOutputStream.java:134)
        at java.io.DataOutputStream.writeInt(DataOutputStream.java:197)
        at 
org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.send(QuorumCnxManager.java:1088)
        at 
org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.run(QuorumCnxManager.java:1115)
[2020-12-08 14:10:22,182] WARN Send worker leaving thread  id 3 my id = 4 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,402] INFO Received connection request 0.0.0.0:41974 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,403] ERROR Failed to send last message. Shutting down 
thread. (org.apache.zookeeper.server.quorum.QuorumCnxManager)
java.net.SocketException: Socket closed
        at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:118)
        at java.net.SocketOutputStream.write(SocketOutputStream.java:134)
        at java.io.DataOutputStream.writeInt(DataOutputStream.java:197)
        at 
org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.send(QuorumCnxManager.java:1088)
        at 
org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.run(QuorumCnxManager.java:1115)
[2020-12-08 14:10:22,403] WARN Send worker leaving thread  id 3 my id = 4 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,404] WARN Interrupting SendWorker 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,829] INFO Received connection request 0.0.0.0:51666 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,830] WARN Send worker leaving thread  id 3 my id = 4 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
[2020-12-08 14:10:22,830] INFO Notification: 2 (message format version), 2 
(n.leader), 0x503300000000 (n.zxid), 0x3d (n.round), LOOKING (n.state), 3 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:22,975] INFO Notification: 2 (message format version), 2 
(n.leader), 0x503300000000 (n.zxid), 0x3d (n.round), LOOKING (n.state), 3 
(n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
(org.apache.zookeeper.server.quorum.FastLeaderElection)
[2020-12-08 14:10:23,443] INFO Shutting down 
(org.apache.zookeeper.server.quorum.Leader)
[2020-12-08 14:10:23,443] INFO Shutdown called 
(org.apache.zookeeper.server.quorum.Leader)
 
java.lang.Exception: shutdown Leader! reason: Not sufficient followers synced, 
only synced with sids: [ [4, 5],[4, 5] ]
 
        at org.apache.zookeeper.server.quorum.Leader.shutdown(Leader.java:682)
 
        at org.apache.zookeeper.server.quorum.Leader.lead(Leader.java:662)
 
        at 
org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1266)
 
[2020-12-08 14:10:23,444] INFO exception while shutting down acceptor: 
java.net.SocketException: Socket closed 
(org.apache.zookeeper.server.quorum.Leader)
[2020-12-08 14:10:23,448] INFO shutting down 
(org.apache.zookeeper.server.ZooKeeperServer)
[2020-12-08 14:10:23,448] INFO Shutting down 
(org.apache.zookeeper.server.SessionTrackerImpl)
[2020-12-08 14:10:23,448] INFO Shutting down 
(org.apache.zookeeper.server.quorum.LeaderRequestProcessor)
[2020-12-08 14:10:23,449] INFO Shutting down 
(org.apache.zookeeper.server.PrepRequestProcessor)
[2020-12-08 14:10:23,449] INFO Shutting down 
(org.apache.zookeeper.server.quorum.ProposalRequestProcessor)
[2020-12-08 14:10:23,449] INFO Shutting down 
(org.apache.zookeeper.server.quorum.CommitProcessor)
[2020-12-08 14:10:23,449] INFO CommitProcessor exited loop! 
(org.apache.zookeeper.server.quorum.CommitProcessor)
[2020-12-08 14:10:23,449] INFO PrepRequestProcessor exited loop! 
(org.apache.zookeeper.server.PrepRequestProcessor)
[2020-12-08 14:10:23,455] INFO Shutting down 
(org.apache.zookeeper.server.quorum.Leader)
[2020-12-08 14:10:23,455] INFO shutdown of request processor complete 
(org.apache.zookeeper.server.FinalRequestProcessor)
[2020-12-08 14:10:23,455] INFO Shutting down 
(org.apache.zookeeper.server.SyncRequestProcessor)
[2020-12-08 14:10:23,455] INFO SyncRequestProcessor exited! 
(org.apache.zookeeper.server.SyncRequestProcessor)
[2020-12-08 14:10:23,530] WARN PeerState set to LOOKING 
(org.apache.zookeeper.server.quorum.QuorumPeer)
[2020-12-08 14:10:23,530] INFO LOOKING 
(org.apache.zookeeper.server.quorum.QuorumPeer)
[2020-12-08 14:10:23,531] WARN ******* GOODBYE /0.0.0.0:46138 ******** 
(org.apache.zookeeper.server.quorum.LearnerHandler)


{noformat}
 


> Leader did not lose the quorum when a node left the quorum of 3 out of 5 
> nodes.
> -------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-4051
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4051
>             Project: ZooKeeper
>          Issue Type: Bug
>    Affects Versions: 3.5.7
>            Reporter: Badai Aqrandista
>            Priority: Major
>
> This Zookeeper ensemble has 5 nodes: node 1, 2, 3, 4 and 5. At the time, 
> leader was node 4. The quorum consisted of node 3, 4 and 5. Node 1 and 2 kept 
> disconnecting from node 4, so they never joined the quorum.
>  
> At 2020-12-08 14:10:23, lost its quorum. But this only occurred after node 3 
> disconnected from node 4 multiple times. The disconnection message from node 
> 3 had occurred more for more than 12 hours prior to this (but no logs prior 
> to that). But the quorum was not lost. Following is form node 4. It shows 
> that when the quorum was lost, there were only 2 nodes left in the quorum: 
> node 4 and 5.
>  
> Note that all IP addresses are replaced with 0.0.0.0 to allow it to be 
> included in this bug report.
>  
> {noformat}
> [2020-12-08 14:10:20,702] INFO Notification: 2 (message format version), 2 
> (n.leader), 0x503300000000 (n.zxid), 0x3c (n.round), LOOKING (n.state), 2 
> (n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
> (org.apache.zookeeper.server.quorum.FastLeaderElection)
> [2020-12-08 14:10:20,918] INFO Notification: 2 (message format version), 2 
> (n.leader), 0x503300000000 (n.zxid), 0x3c (n.round), LOOKING (n.state), 2 
> (n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
> (org.apache.zookeeper.server.quorum.FastLeaderElection)
> [2020-12-08 14:10:21,045] INFO Received connection request 0.0.0.0:41966 
> (org.apache.zookeeper.server.quorum.QuorumCnxManager)
> [2020-12-08 14:10:21,056] INFO Notification: 2 (message format version), 2 
> (n.leader), 0x503300000000 (n.zxid), 0x3d (n.round), LOOKING (n.state), 2 
> (n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
> (org.apache.zookeeper.server.quorum.FastLeaderElection)
> [2020-12-08 14:10:21,193] INFO Notification: 2 (message format version), 1 
> (n.leader), 0x420400000004 (n.zxid), 0x3d (n.round), LOOKING (n.state), 1 
> (n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
> (org.apache.zookeeper.server.quorum.FastLeaderElection)
> [2020-12-08 14:10:21,193] INFO Notification: 2 (message format version), 1 
> (n.leader), 0x420400000004 (n.zxid), 0x3d (n.round), LOOKING (n.state), 1 
> (n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
> (org.apache.zookeeper.server.quorum.FastLeaderElection)
> [2020-12-08 14:10:21,204] INFO Notification: 2 (message format version), 2 
> (n.leader), 0x503300000000 (n.zxid), 0x3d (n.round), LOOKING (n.state), 1 
> (n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
> (org.apache.zookeeper.server.quorum.FastLeaderElection)
> [2020-12-08 14:10:22,180] INFO Received connection request 0.0.0.0:41970 
> (org.apache.zookeeper.server.quorum.QuorumCnxManager)
> [2020-12-08 14:10:22,181] WARN Connection broken for id 3, my id = 4, error = 
>  (org.apache.zookeeper.server.quorum.QuorumCnxManager)
> java.net.SocketException: Socket closed
>         at java.net.SocketInputStream.socketRead0(Native Method)
>         at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
>         at java.net.SocketInputStream.read(SocketInputStream.java:171)
>         at java.net.SocketInputStream.read(SocketInputStream.java:141)
>         at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
>         at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
>         at java.io.DataInputStream.readInt(DataInputStream.java:387)
>         at 
> org.apache.zookeeper.server.quorum.QuorumCnxManager$RecvWorker.run(QuorumCnxManager.java:1212)
> [2020-12-08 14:10:22,181] WARN Interrupting SendWorker 
> (org.apache.zookeeper.server.quorum.QuorumCnxManager)
> [2020-12-08 14:10:22,182] ERROR Failed to send last message. Shutting down 
> thread. (org.apache.zookeeper.server.quorum.QuorumCnxManager)
> java.net.SocketException: Socket closed
>         at 
> java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:118)
>         at java.net.SocketOutputStream.write(SocketOutputStream.java:134)
>         at java.io.DataOutputStream.writeInt(DataOutputStream.java:197)
>         at 
> org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.send(QuorumCnxManager.java:1088)
>         at 
> org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.run(QuorumCnxManager.java:1115)
> [2020-12-08 14:10:22,182] WARN Send worker leaving thread  id 3 my id = 4 
> (org.apache.zookeeper.server.quorum.QuorumCnxManager)
> [2020-12-08 14:10:22,402] INFO Received connection request 0.0.0.0:41974 
> (org.apache.zookeeper.server.quorum.QuorumCnxManager)
> [2020-12-08 14:10:22,403] ERROR Failed to send last message. Shutting down 
> thread. (org.apache.zookeeper.server.quorum.QuorumCnxManager)
> java.net.SocketException: Socket closed
>         at 
> java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:118)
>         at java.net.SocketOutputStream.write(SocketOutputStream.java:134)
>         at java.io.DataOutputStream.writeInt(DataOutputStream.java:197)
>         at 
> org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.send(QuorumCnxManager.java:1088)
>         at 
> org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.run(QuorumCnxManager.java:1115)
> [2020-12-08 14:10:22,403] WARN Send worker leaving thread  id 3 my id = 4 
> (org.apache.zookeeper.server.quorum.QuorumCnxManager)
> [2020-12-08 14:10:22,404] WARN Interrupting SendWorker 
> (org.apache.zookeeper.server.quorum.QuorumCnxManager)
> [2020-12-08 14:10:22,829] INFO Received connection request 0.0.0.0:51666 
> (org.apache.zookeeper.server.quorum.QuorumCnxManager)
> [2020-12-08 14:10:22,830] WARN Send worker leaving thread  id 3 my id = 4 
> (org.apache.zookeeper.server.quorum.QuorumCnxManager)
> [2020-12-08 14:10:22,830] INFO Notification: 2 (message format version), 2 
> (n.leader), 0x503300000000 (n.zxid), 0x3d (n.round), LOOKING (n.state), 3 
> (n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
> (org.apache.zookeeper.server.quorum.FastLeaderElection)
> [2020-12-08 14:10:22,975] INFO Notification: 2 (message format version), 2 
> (n.leader), 0x503300000000 (n.zxid), 0x3d (n.round), LOOKING (n.state), 3 
> (n.sid), 0x5033 (n.peerEPoch), LEADING (my state)0 (n.config version) 
> (org.apache.zookeeper.server.quorum.FastLeaderElection)
> [2020-12-08 14:10:23,443] INFO Shutting down 
> (org.apache.zookeeper.server.quorum.Leader)
> [2020-12-08 14:10:23,443] INFO Shutdown called 
> (org.apache.zookeeper.server.quorum.Leader)
>  
> java.lang.Exception: shutdown Leader! reason: Not sufficient followers 
> synced, only synced with sids: [ [4, 5],[4, 5] ]
>  
>         at org.apache.zookeeper.server.quorum.Leader.shutdown(Leader.java:682)
>  
>         at org.apache.zookeeper.server.quorum.Leader.lead(Leader.java:662)
>  
>         at 
> org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1266)
>  
> [2020-12-08 14:10:23,444] INFO exception while shutting down acceptor: 
> java.net.SocketException: Socket closed 
> (org.apache.zookeeper.server.quorum.Leader)
> [2020-12-08 14:10:23,448] INFO shutting down 
> (org.apache.zookeeper.server.ZooKeeperServer)
> [2020-12-08 14:10:23,448] INFO Shutting down 
> (org.apache.zookeeper.server.SessionTrackerImpl)
> [2020-12-08 14:10:23,448] INFO Shutting down 
> (org.apache.zookeeper.server.quorum.LeaderRequestProcessor)
> [2020-12-08 14:10:23,449] INFO Shutting down 
> (org.apache.zookeeper.server.PrepRequestProcessor)
> [2020-12-08 14:10:23,449] INFO Shutting down 
> (org.apache.zookeeper.server.quorum.ProposalRequestProcessor)
> [2020-12-08 14:10:23,449] INFO Shutting down 
> (org.apache.zookeeper.server.quorum.CommitProcessor)
> [2020-12-08 14:10:23,449] INFO CommitProcessor exited loop! 
> (org.apache.zookeeper.server.quorum.CommitProcessor)
> [2020-12-08 14:10:23,449] INFO PrepRequestProcessor exited loop! 
> (org.apache.zookeeper.server.PrepRequestProcessor)
> [2020-12-08 14:10:23,455] INFO Shutting down 
> (org.apache.zookeeper.server.quorum.Leader)
> [2020-12-08 14:10:23,455] INFO shutdown of request processor complete 
> (org.apache.zookeeper.server.FinalRequestProcessor)
> [2020-12-08 14:10:23,455] INFO Shutting down 
> (org.apache.zookeeper.server.SyncRequestProcessor)
> [2020-12-08 14:10:23,455] INFO SyncRequestProcessor exited! 
> (org.apache.zookeeper.server.SyncRequestProcessor)
> [2020-12-08 14:10:23,530] WARN PeerState set to LOOKING 
> (org.apache.zookeeper.server.quorum.QuorumPeer)
> [2020-12-08 14:10:23,530] INFO LOOKING 
> (org.apache.zookeeper.server.quorum.QuorumPeer)
> [2020-12-08 14:10:23,531] WARN ******* GOODBYE /0.0.0.0:46138 ******** 
> (org.apache.zookeeper.server.quorum.LearnerHandler)
> {noformat}
>  



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