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From "Mark Fenes (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (ZOOKEEPER-2727) WARN and stacktrace for normally closed socket
Date Fri, 23 Mar 2018 14:44:00 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-2727?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mark Fenes resolved ZOOKEEPER-2727.
-----------------------------------
    Resolution: Won't Fix

> 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
>            Priority: Major
>
> 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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