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From Sebastian Schmitz <sebastian.schm...@propellerhead.co.nz>
Subject Zookeeper 3.5.6 - Exception causing close of session 0x0: null
Date Thu, 24 Oct 2019 22:05:38 GMT
Hello,

I did a rolling upgrade of the Zookeeper from 3.4.14 to 3.5.6 on 23rd in 
my Test-Environment. It's zookeeping a three node Kafka-Cluster running 
on 2.3.0.

After the update I get spammed with these warnings:

Oct 25 10:56:23   zookeeper_node_1: 2019-10-24 21:56:23,119 [myid:1] - 
WARN  [NIOWorkerThread-6:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:23   zookeeper_node_2: 2019-10-24 21:56:23,478 [myid:2] - 
WARN  [NIOWorkerThread-1:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:23   zookeeper_node_3: 2019-10-24 21:56:23,531 [myid:3] - 
WARN  [NIOWorkerThread-3:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:23   zookeeper_node_1: 2019-10-24 21:56:23,776 [myid:1] - 
WARN  [NIOWorkerThread-8:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:23   zookeeper_node_2: 2019-10-24 21:56:23,879 [myid:2] - 
WARN  [NIOWorkerThread-5:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:24   zookeeper_node_3: 2019-10-24 21:56:24,086 [myid:3] - 
WARN  [NIOWorkerThread-4:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:24   zookeeper_node_1: 2019-10-24 21:56:24,090 [myid:1] - 
WARN  [NIOWorkerThread-4:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:24   zookeeper_node_2: 2019-10-24 21:56:24,497 [myid:2] - 
WARN  [NIOWorkerThread-2:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:24   zookeeper_node_3: 2019-10-24 21:56:24,601 [myid:3] - 
WARN  [NIOWorkerThread-1:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:24   zookeeper_node_1: 2019-10-24 21:56:24,798 [myid:1] - 
WARN  [NIOWorkerThread-3:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:24   zookeeper_node_3: 2019-10-24 21:56:24,904 [myid:3] - 
WARN  [NIOWorkerThread-6:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:25   zookeeper_node_2: 2019-10-24 21:56:25,007 [myid:2] - 
WARN  [NIOWorkerThread-3:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:25   zookeeper_node_1: 2019-10-24 21:56:25,260 [myid:1] - 
WARN  [NIOWorkerThread-5:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:25   zookeeper_node_3: 2019-10-24 21:56:25,467 [myid:3] - 
WARN  [NIOWorkerThread-8:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:25   zookeeper_node_2: 2019-10-24 21:56:25,619 [myid:2] - 
WARN  [NIOWorkerThread-8:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:25   zookeeper_node_1: 2019-10-24 21:56:25,666 [myid:1] - 
WARN  [NIOWorkerThread-7:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:26   zookeeper_node_3: 2019-10-24 21:56:25,923 [myid:3] - 
WARN  [NIOWorkerThread-5:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:26   zookeeper_node_2: 2019-10-24 21:56:26,178 [myid:2] - 
WARN  [NIOWorkerThread-5:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:26   zookeeper_node_1: 2019-10-24 21:56:26,329 [myid:1] - 
WARN  [NIOWorkerThread-1:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:26   zookeeper_node_3: 2019-10-24 21:56:26,484 [myid:3] - 
WARN  [NIOWorkerThread-3:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:26   zookeeper_node_2: 2019-10-24 21:56:26,792 [myid:2] - 
WARN  [NIOWorkerThread-4:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:26   zookeeper_node_3: 2019-10-24 21:56:26,890 [myid:3] - 
WARN  [NIOWorkerThread-7:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:26   zookeeper_node_1: 2019-10-24 21:56:26,888 [myid:1] - 
WARN  [NIOWorkerThread-2:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:27   zookeeper_node_2: 2019-10-24 21:56:27,347 [myid:2] - 
WARN  [NIOWorkerThread-7:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:27   zookeeper_node_1: 2019-10-24 21:56:27,354 [myid:1] - 
WARN  [NIOWorkerThread-4:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:27   zookeeper_node_3: 2019-10-24 21:56:27,662 [myid:3] - 
WARN  [NIOWorkerThread-2:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:27   zookeeper_node_3: 2019-10-24 21:56:27,810 [myid:3] - 
WARN  [NIOWorkerThread-6:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:27   zookeeper_node_1: 2019-10-24 21:56:27,811 [myid:1] - 
WARN  [NIOWorkerThread-2:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:27   zookeeper_node_2: 2019-10-24 21:56:27,816 [myid:2] - 
WARN  [NIOWorkerThread-2:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:28   zookeeper_node_2: 2019-10-24 21:56:28,366 [myid:2] - 
WARN  [NIOWorkerThread-6:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null
Oct 25 10:56:28   zookeeper_node_1: 2019-10-24 21:56:28,474 [myid:1] - 
WARN  [NIOWorkerThread-6:NIOServerCnxn@370] - Exception causing close of 
session 0x0: null

A quick search didn't return anything, but my guess is that it might 
have to do with the upgrade from 3.4.14 and maybe old stuff remaining?

So any idea for what to check or do would be greatly appreciated.

Thanks

Sebastian


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