[jira] [Created] (ZOOKEEPER-2727) WARN and stacktrace for normally closed socket

["Andrey (JIRA)" <ji...@apache.org>]

Andrey created ZOOKEEPER-2727:
---------------------------------

             Summary: WARN and stacktrace for normally closed socket
                 Key: ZOOKEEPER-2727
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2727
             Project: ZooKeeper
          Issue Type: Bug
    Affects Versions: 3.4.9
            Reporter: Andrey


Steps to reproduce:
* setup zookeeper
* setup TCP load balancer. This balancer should check zookeeper clientPort liveness(healthcheck) by opening and closing TCP connection to clientPort. See https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/ or https://www.digitalocean.com/community/tutorials/how-to-create-your-first-digitalocean-load-balancer#step-2-—-creating-the-load-balancer for details. 
* in logs:
{code}
2017-03-17 15:41:19,843 [myid:1] - WARN  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@357] - caught end of stream exception
EndOfStreamException: Unable to read additional data from client sessionid 0x0, likely client has closed socket
	at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:228)
	at org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:203)
	at java.lang.Thread.run(Thread.java:745)
{code}

Issue is here:
https://github.com/apache/zookeeper/blob/5fe68506f217246c7ebd96803f9c78e13ec2f11a/src/java/main/org/apache/zookeeper/server/NIOServerCnxn.java#L322

-1 is a normal socket termination. 

Expected:
* reduce log level to INFO
* do not log stacktrace.



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