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https://issues.apache.org/jira/browse/ZOOKEEPER-344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12694673#action_12694673
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bryan thompson commented on ZOOKEEPER-344:
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It is a Linux platform, which I describe above.  it is a standalone instance 
however rather than an ensemble.

> doIO in NioServerCnxn: Exception causing close of session : cause is "read 
> error"
> ---------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-344
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-344
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: java client, server
>    Affects Versions: 3.1.0
>         Environment: jdk1.6.0_07
> Linux blade2 2.6.27.7-134.fc10.x86_64 #1 SMP Mon Dec 1 22:21:35 EST 2008 
> x86_64 x86_64 x86_64 GNU/Linux
>            Reporter: bryan thompson
>             Fix For: 3.2.0
>
>
> I have been having a problem with zookeeper 3.0.1 and now with 3.1.0 where I 
> see a lot of expired sessions.  I am using a 16 node cluster which is all on 
> the same local network.  There is a single zookeeper instance (these are 
> benchmarking runs).
> The problem appears to be correlated with either run time or system load.\
> Personally I think that it is system load because I have session session 
> expired events under a Windows platform running zookeeper and the application 
> (i.e., everthing is local) when the application load suddenly spikes.  To me 
> this suggests that the client is not able to renew (ping) the zookeeper 
> service in a timely manner and is expired.  But the log messages below with 
> the "read error" suggest that maybe there is something else going on?
> Zookeeper Configuration
> #Wed Mar 18 12:41:05 GMT-05:00 2009
> clientPort=2181
> dataDir=/var/bigdata/benchmark/zookeeper/1
> syncLimit=2
> dataLogDir=/var/bigdata/benchmark/zookeeper/1
> tickTime=2000
> Some representative log messages are below.
> Client side messages (from our app)
> ERROR [main-EventThread] 
> com.bigdata.zookeeper.ZLockImpl$ZLockWatcher.process(ZLockImpl.java:400) 
> 2009-03-18 13:35:40,335 - Session expired: WatchedEvent: Server state change. 
> New state: Expired : 
> zpath=/benchmark/jobs/com.bigdata.service.jini.benchmark.ThroughputMaster/test_1/client1160/locknode
> ERROR [main-EventThread] 
> com.bigdata.zookeeper.ZLockImpl$ZLockWatcher.process(ZLockImpl.java:400) 
> 2009-03-18 13:35:40,335 - Session expired: WatchedEvent: Server state change. 
> New state: Expired : 
> zpath=/benchmark/jobs/com.bigdata.service.jini.benchmark.ThroughputMaster/test_1/client1356/locknode
> Server side messages:
>  WARN [NIOServerCxn.Factory:2181] 
> org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:417) 
> 2009-03-18 13:06:57,252 - Exception causing close of session 
> 0x1201aac14300022 due to java.io.IOException: Read error
>  WARN [NIOServerCxn.Factory:2181] 
> org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:417) 
> 2009-03-18 13:06:58,198 - Exception causing close of session 
> 0x1201aac1430000f due to java.io.IOException: Read error

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