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From "Michael K. Edwards (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-3036) Unexpected exception in zookeeper
Date Sun, 14 Apr 2019 16:58:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16817358#comment-16817358
] 

Michael K. Edwards commented on ZOOKEEPER-3036:
-----------------------------------------------

We encountered a similar error on the Leader of our production ZooKeeper cluster (running
stock 3.4.13, 7 voting members, 2 observers).
{noformat}
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:18:16,065 [myid:6] - ERROR
[LearnerHandler-/10.3.50.66:39854:LearnerHandler@648] - Unexpected exception causing shutdown
while sock still open
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: java.net.SocketTimeoutException: Read
timed out
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: #011at java.net.SocketInputStream.socketRead0(Native
Method)
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: #011at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: #011at java.net.SocketInputStream.read(SocketInputStream.java:171)
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: #011at java.net.SocketInputStream.read(SocketInputStream.java:141)
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: #011at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: #011at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: #011at java.io.DataInputStream.readInt(DataInputStream.java:387)
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: #011at org.apache.jute.BinaryInputArchive.readInt(BinaryInputArchive.java:63)
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: #011at org.apache.zookeeper.server.quorum.QuorumPacket.deserialize(QuorumPacket.java:85)
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: #011at org.apache.jute.BinaryInputArchive.readRecord(BinaryInputArchive.java:99)
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: #011at org.apache.zookeeper.server.quorum.LearnerHandler.run(LearnerHandler.java:559)
Apr 12 16:18:16 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:18:16,065 [myid:6] - WARN
 [LearnerHandler-/10.3.50.66:39854:LearnerHandler@661] - ******* GOODBYE /10.3.50.66:39854
********
Apr 12 16:18:17 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:18:17,079 [myid:6] - INFO
 [SessionTracker:ZooKeeperServer@355] - Expiring session 0x90000180f040009, timeout of 6000ms
exceeded
Apr 12 16:18:17 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:18:17,080 [myid:6] - INFO
 [ProcessThread(sid:6 cport:-1)::PrepRequestProcessor@487] - Processed session termination
for sessionid: 0x90000180f040009
Apr 12 16:18:17 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:18:17,084 [myid:6] - INFO
 [ProcessThread(sid:6 cport:-1)::PrepRequestProcessor@653] - Got user-level KeeperException
when processing sessionid:0x90000180f040007 type:create cxid:0x1da9 zxid:0x9000126d8 txntype:-1
reqpath:n/a Error Path:/kafka/controller Error:KeeperErrorCode = NodeExists for /kafka/controller
Apr 12 16:18:19 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:18:19,897 [myid:6] - INFO
 [ProcessThread(sid:6 cport:-1)::PrepRequestProcessor@653] - Got user-level KeeperException
when processing sessionid:0x800001d10880004 type:delete cxid:0x566b zxid:0x900012dbd txntype:-1
reqpath:n/a Error Path:/kafka/admin/preferred_replica_election Error:KeeperErrorCode = NoNode
for /kafka/admin/preferred_replica_election
{noformat}

It appears as though this was the first anomalous behavior logged by the cluster, and triggered
this failure at the observer on the other end of the connection:
{noformat}
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,066 [myid:9] - WARN
 [QuorumPeer[myid=9]/0:0:0:0:0:0:0:0:2181:Observer@77] - Exception when observing the leader
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: java.io.EOFException
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: #011at java.io.DataInputStream.readInt(DataInputStream.java:392)
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: #011at org.apache.jute.BinaryInputArchive.readInt(BinaryInputArchive.java:63)
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: #011at org.apache.zookeeper.server.quorum.QuorumPacket.deserialize(QuorumPacket.java:85)
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: #011at org.apache.jute.BinaryInputArchive.readRecord(BinaryInputArchive.java:99)
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: #011at org.apache.zookeeper.server.quorum.Learner.readPacket(Learner.java:153)
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: #011at org.apache.zookeeper.server.quorum.Observer.observeLeader(Observer.java:73)
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: #011at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:968)
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,066 [myid:9] - INFO
 [QuorumPeer[myid=9]/0:0:0:0:0:0:0:0:2181:Observer@137] - shutdown called
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: java.lang.Exception: shutdown Observer
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: #011at org.apache.zookeeper.server.quorum.Observer.shutdown(Observer.java:137)
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: #011at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:972)
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,067 [myid:9] - INFO
 [QuorumPeer[myid=9]/0:0:0:0:0:0:0:0:2181:NIOServerCnxn@1056] - Closed socket connection for
client /10.3.50.199:55168 which had sessionid 0x90000180f040009
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,067 [myid:9] - INFO
 [QuorumPeer[myid=9]/0:0:0:0:0:0:0:0:2181:NIOServerCnxn@1056] - Closed socket connection for
client /10.3.50.111:44036 which had sessionid 0x90000180f040005
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,068 [myid:9] - INFO
 [QuorumPeer[myid=9]/0:0:0:0:0:0:0:0:2181:NIOServerCnxn@1056] - Closed socket connection for
client /10.3.50.87:47988 which had sessionid 0x90000180f040007
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,068 [myid:9] - INFO
 [QuorumPeer[myid=9]/0:0:0:0:0:0:0:0:2181:ZooKeeperServer@502] - shutting down
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,068 [myid:9] - INFO
 [QuorumPeer[myid=9]/0:0:0:0:0:0:0:0:2181:ObserverRequestProcessor@121] - Shutting down
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,068 [myid:9] - INFO
 [QuorumPeer[myid=9]/0:0:0:0:0:0:0:0:2181:CommitProcessor@184] - Shutting down
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,068 [myid:9] - INFO
 [QuorumPeer[myid=9]/0:0:0:0:0:0:0:0:2181:FinalRequestProcessor@403] - shutdown of request
processor complete
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,069 [myid:9] - INFO
 [CommitProcessor:9:CommitProcessor@153] - CommitProcessor exited loop!
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,071 [myid:9] - INFO
 [ObserverRequestProcessor:9:ObserverRequestProcessor@105] - ObserverRequestProcessor exited
loop!
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,110 [myid:9] - INFO
 [QuorumPeer[myid=9]/0:0:0:0:0:0:0:0:2181:SyncRequestProcessor@208] - Shutting down
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,110 [myid:9] - INFO
 [SyncThread:9:SyncRequestProcessor@186] - SyncRequestProcessor exited!
{noformat}

However, this seems to have left the observer internally corrupted.  It starts a new election
cycle, but receives a response from only 1 out of 7 of the voting members (not the Leader):
{noformat}
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,111 [myid:9] - INFO
 [QuorumPeer[myid=9]/0:0:0:0:0:0:0:0:2181:QuorumPeer@909] - LOOKING
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,112 [myid:9] - INFO
 [QuorumPeer[myid=9]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@813] - New election. My id =
 9, proposed zxid=0x8000000000000000
Apr 12 16:18:16 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:18:16,121 [myid:9] - INFO
 [WorkerReceiver[myid=9]:FastLeaderElection@595] - Notification: 1 (message format version),
6 (n.leader), 0x80002cdb7 (n.zxid), 0x9 (n.round), FOLLOWING (n.state), 7 (n.sid), 0x9 (n.peerEpoch)
LOOKING (my state)
{noformat}

It failed to send to (and receive an ack from) the other six voting members for 15 minutes'
worth of retry cycles.  Then it dumped a bunch of these (same spew for each id from 1 to 6,
all in the same second):
{noformat}
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:33:47,001 [myid:9] - WARN
 [RecvWorker:6:QuorumCnxManager$RecvWorker@1025] - Connection broken for id 6, my id = 9,
error =
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: java.net.SocketException: Connection timed
out (Read failed)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at java.net.SocketInputStream.socketRead0(Native
Method)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at java.net.SocketInputStream.read(SocketInputStream.java:171)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at java.net.SocketInputStream.read(SocketInputStream.java:141)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at java.io.DataInputStream.readInt(DataInputStream.java:387)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at org.apache.zookeeper.server.quorum.QuorumCnxManager$RecvWorker.run(QuorumCnxManager.java:1010)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:33:47,006 [myid:9] - WARN
 [RecvWorker:6:QuorumCnxManager$RecvWorker@1028] - Interrupting SendWorker
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:33:47,007 [myid:9] - WARN
 [SendWorker:6:QuorumCnxManager$SendWorker@941] - Interrupted while waiting for message on
queue
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: java.lang.InterruptedException
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:2014)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2088)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at java.util.concurrent.ArrayBlockingQueue.poll(ArrayBlockingQueue.java:418)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at org.apache.zookeeper.server.quorum.QuorumCnxManager.pollSendQueue(QuorumCnxManager.java:1094)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at org.apache.zookeeper.server.quorum.QuorumCnxManager.access$700(QuorumCnxManager.java:74)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: #011at org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.run(QuorumCnxManager.java:929)
Apr 12 16:33:47 prod-zk-observer-2 zookeeper[1114]: 2019-04-12 16:33:47,007 [myid:9] - WARN
 [SendWorker:6:QuorumCnxManager$SendWorker@951] - Send worker leaving thread
{noformat}

And the really weird thing is, both ends of the connection appear to have perceived a timeout,
rather than one timing out and sending a TCP RST and the other seeing an EOF.  On the Leader
side, after the connection finally timed out, we got a new connection request the next time
the Observer's 60-second timer rolled around, followed by a normal observer-rejoining sequence:
{noformat}
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:33:47,139 [myid:6] - WARN
 [RecvWorker:9:QuorumCnxManager$RecvWorker@1025] - Connection broken for id 9, my id = 6,
error =
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: java.net.SocketException: Connection timed
out (Read failed)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at java.net.SocketInputStream.socketRead0(Native
Method)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at java.net.SocketInputStream.read(SocketInputStream.java:171)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at java.net.SocketInputStream.read(SocketInputStream.java:141)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at java.io.DataInputStream.readInt(DataInputStream.java:387)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at org.apache.zookeeper.server.quorum.QuorumCnxManager$RecvWorker.run(QuorumCnxManager.java:1010)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:33:47,139 [myid:6] - WARN
 [RecvWorker:9:QuorumCnxManager$RecvWorker@1028] - Interrupting SendWorker
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:33:47,140 [myid:6] - WARN
 [SendWorker:9:QuorumCnxManager$SendWorker@941] - Interrupted while waiting for message on
queue
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: java.lang.InterruptedException
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:2014)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2088)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at java.util.concurrent.ArrayBlockingQueue.poll(ArrayBlockingQueue.java:418)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at org.apache.zookeeper.server.quorum.QuorumCnxManager.pollSendQueue(QuorumCnxManager.java:1094)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at org.apache.zookeeper.server.quorum.QuorumCnxManager.access$700(QuorumCnxManager.java:74)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: #011at org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.run(QuorumCnxManager.java:929)
Apr 12 16:33:47 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:33:47,140 [myid:6] - WARN
 [SendWorker:9:QuorumCnxManager$SendWorker@951] - Send worker leaving thread
Apr 12 16:33:58 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:33:58,373 [myid:6] - INFO
 [/10.3.50.250:3888:QuorumCnxManager$Listener@743] - Received connection request /10.3.50.66:35984
Apr 12 16:33:58 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:33:58,380 [myid:6] - INFO
 [LearnerHandler-/10.3.50.66:40180:LearnerHandler@346] - Follower sid: 9 : info : org.apache.zookeeper.server.quorum.QuorumPeer$QuorumServer@24db1c2b
Apr 12 16:33:58 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:33:58,381 [myid:6] - INFO
 [LearnerHandler-/10.3.50.66:40180:LearnerHandler@401] - Synchronizing with Follower sid:
9 maxCommittedLog=0x9000134b2 minCommittedLog=0x9000132be peerLastZxid=0x9000126d5
Apr 12 16:33:58 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:33:58,381 [myid:6] - WARN
 [LearnerHandler-/10.3.50.66:40180:LearnerHandler@468] - Unhandled proposal scenario
Apr 12 16:33:58 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:33:58,381 [myid:6] - INFO
 [LearnerHandler-/10.3.50.66:40180:LearnerHandler@475] - Sending SNAP
Apr 12 16:33:58 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:33:58,381 [myid:6] - INFO
 [LearnerHandler-/10.3.50.66:40180:LearnerHandler@499] - Sending snapshot last zxid of peer
is 0x9000126d5  zxid of leader is 0x9000134b2sent zxid of db as 0x9000134b2
Apr 12 16:33:58 prod-zk-voter-aza2 zookeeper[1129]: 2019-04-12 16:33:58,519 [myid:6] - INFO
 [LearnerHandler-/10.3.50.66:40180:LearnerHandler@535] - Received NEWLEADER-ACK message from
9
{noformat}

I have no idea where it would get a 900-second timeout from.  If I understand the flow correctly,
the timeout should have been 4 seconds (syncLimit = 2, times tickTime = 2000 ms).
{noformat}
clientPort=2181
dataDir=/zookeeper
tickTime=2000
initLimit=5
syncLimit=2
peerType=observer
server.1=10.3.52.83:2888:3888
server.2=10.3.52.245:2888:3888
server.3=10.3.51.102:2888:3888
server.4=10.3.51.53:2888:3888
server.5=10.3.50.133:2888:3888
server.6=10.3.50.250:2888:3888
server.7=10.3.50.62:2888:3888
server.8=10.3.50.128:2888:3888:observer
server.9=10.3.50.66:2888:3888:observer
{noformat}


> Unexpected exception in zookeeper
> ---------------------------------
>
>                 Key: ZOOKEEPER-3036
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3036
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: quorum, server
>    Affects Versions: 3.4.10
>         Environment: 3 Zookeepers, 5 kafka servers
>            Reporter: Oded
>            Priority: Critical
>
> We got an issue with one of the zookeeprs (Leader), causing the entire kafka cluster
to fail:
> 2018-05-09 02:29:01,730 [myid:3] - ERROR [LearnerHandler-/192.168.0.91:42490:LearnerHandler@648]
- Unexpected exception causing shutdown while sock still open
> java.net.SocketTimeoutException: Read timed out
>         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.jute.BinaryInputArchive.readInt(BinaryInputArchive.java:63)
>         at org.apache.zookeeper.server.quorum.QuorumPacket.deserialize(QuorumPacket.java:83)
>         at org.apache.jute.BinaryInputArchive.readRecord(BinaryInputArchive.java:99)
>         at org.apache.zookeeper.server.quorum.LearnerHandler.run(LearnerHandler.java:559)
> 2018-05-09 02:29:01,730 [myid:3] - WARN  [LearnerHandler-/192.168.0.91:42490:LearnerHandler@661]
- ******* GOODBYE /192.168.0.91:42490 ********
>  
> We would expect that zookeeper will choose another Leader and the Kafka cluster will
continue to work as expected, but that was not the case.
>  



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