Zookeeper logging “exception causing close of session 0x0” infinitely in logs

[Shantanu Deshmukh <sh...@gmail.com>]

 We have a cluster of 3 kafka+zookeeper. Only on one of our zookeeper
servers we are seeing these logs infinitely getting written in
zookeeper.out log file

WARN [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCxn@1033] -
Exception causing close of session 0x0 due to java.io.Exception
INFO [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCxn@1033] -
Closed socket connection from /10.189.177.31:65429 (no session
established for client)

I have no idea what this server 10.189.177.31 is. No Kafka consumer is
running on this machine.

No changes to zookeeper was made. Due to disk full issue cluster had
crashed. So we started all brokers and zookeepers. Everything went well
except for this one. What can be done for this case? As zk is logging so
heavily it will fill up the disk again with just these logs. Please help

Re: Zookeeper logging “exception causing close of session 0x0” infinitely in logs

[Manjunath N <ma...@gmail.com>]

Check this thread. Not sure if it is the same case. you could also enable trace and see if you can find more information.

http://zookeeper-user.578899.n2.nabble.com/chatty-error-Exception-causing-close-of-session-0x0-due-to-java-io-IOException-Len-error-1835955314-td7198695.html <http://zookeeper-user.578899.n2.nabble.com/chatty-error-Exception-causing-close-of-session-0x0-due-to-java-io-IOException-Len-error-1835955314-td7198695.html>

Also, if this host is the zookeeper leader you can restart and observe if the same behavior is reproducible when the leadership moves to another host.


> On Aug 6, 2018, at 3:46 PM, Shantanu Deshmukh <sh...@gmail.com> wrote:
> 
> We have a cluster of 3 kafka+zookeeper. Only on one of our zookeeper
> servers we are seeing these logs infinitely getting written in
> zookeeper.out log file
> 
> WARN [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCxn@1033] -
> Exception causing close of session 0x0 due to java.io.Exception
> INFO [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCxn@1033] -
> Closed socket connection from /10.189.177.31:65429 (no session
> established for client)
> 
> I have no idea what this server 10.189.177.31 is. No Kafka consumer is
> running on this machine.
> 
> No changes to zookeeper was made. Due to disk full issue cluster had
> crashed. So we started all brokers and zookeepers. Everything went well
> except for this one. What can be done for this case? As zk is logging so
> heavily it will fill up the disk again with just these logs. Please help