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https://issues.apache.org/jira/browse/ZOOKEEPER-2727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16193343#comment-16193343
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ASF GitHub Bot commented on ZOOKEEPER-2727:
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Github user phunt commented on the issue:
https://github.com/apache/zookeeper/pull/391
See my comment above. Additionally I would not have approved of the other
change mentioned (moving that to debug).
> 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
> Assignee: Mark Fenes
>
> 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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