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From Sebastian Schmitz <sebastian.schm...@propellerhead.co.nz>
Subject Re: Zookeeper 3.5.6 - Exception causing close of session 0x0: null
Date Thu, 24 Oct 2019 22:16:44 GMT
Hello Again,

I have a small correction to make... It didn't start after the upgrade 
to 3.5.6, but just in the middle of a day at 14:50 on 21st.... And the 
upgrade to 3.5.6 didn't automagically solve it....

So any help to find the cause of this would be great.

Thanks

Sebastian


On 25-Oct-19 11:05 AM, Sebastian Schmitz wrote:
> 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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