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https://issues.apache.org/jira/browse/ZOOKEEPER-832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Hunt updated ZOOKEEPER-832:
-----------------------------------

    Fix Version/s: 3.4.0
      Component/s: c client
                   java client

Good catch, marking for 3.4.0 (we should verify both java and c clients)

> Invalid session id causes infinite loop during automatic reconnect
> ------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-832
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-832
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: c client, java client
>    Affects Versions: 3.3.1
>         Environment: Mac OS X 10.6.4
> JVM 1.6.0_20
>            Reporter: Ryan Holmes
>             Fix For: 3.4.0
>
>
> Steps to reproduce:
> 1.) Connect to a standalone server using the Java client.
> 2.) Stop the server.
> 3.) Delete the contents of the data directory (i.e. the persisted session 
> data).
> 4.) Start the server.
> The client now automatically tries to reconnect but the server refuses the 
> connection because the session id is invalid. The client and server are now 
> in an infinite loop of attempted and rejected connections. While this 
> situation represents a catastrophic failure and the current behavior is not 
> incorrect, it appears that there is no way to detect this situation on the 
> client and therefore no way to recover.
> The suggested improvement is to send an event to the default watcher 
> indicating that the current state is "session invalid", similar to how the 
> "session expired" state is handled.
> Server log output (repeats indefinitely):
> 2010-08-05 11:48:08,283 - INFO  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:nioservercnxn$fact...@250] - 
> Accepted socket connection from /127.0.0.1:63292
> 2010-08-05 11:48:08,284 - INFO  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:nioserverc...@751] - Refusing 
> session request for client /127.0.0.1:63292 as it has seen zxid 0x44 our last 
> zxid is 0x0 client must try another server
> 2010-08-05 11:48:08,284 - INFO  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:nioserverc...@1434] - Closed 
> socket connection for client /127.0.0.1:63292 (no session established for 
> client)
> Client log output (repeats indefinitely):
> 11:47:17 org.apache.zookeeper.ClientCnxn startConnect INFO line 1000 - 
> Opening socket connection to server localhost/127.0.0.1:2181
> 11:47:17 org.apache.zookeeper.ClientCnxn run WARN line 1120 - Session 
> 0x12a3ae4e893000a for server null, unexpected error, closing socket 
> connection and attempting reconnect
> java.net.ConnectException: Connection refused
>       at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>       at 
> sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
>       at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1078)
> 11:47:17 org.apache.zookeeper.ClientCnxn cleanup DEBUG line 1167 - Ignoring 
> exception during shutdown input
> java.nio.channels.ClosedChannelException
>       at 
> sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:638)
>       at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:360)
>       at 
> org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1164)
>       at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1129)
> 11:47:17 org.apache.zookeeper.ClientCnxn cleanup DEBUG line 1174 - Ignoring 
> exception during shutdown output
> java.nio.channels.ClosedChannelException
>       at 
> sun.nio.ch.SocketChannelImpl.shutdownOutput(SocketChannelImpl.java:649)
>       at sun.nio.ch.SocketAdaptor.shutdownOutput(SocketAdaptor.java:368)
>       at 
> org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1171)
>       at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1129)

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