Invalid session id causes infinite loop during automatic reconnect
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Key: ZOOKEEPER-832
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-832
Project: Zookeeper
Issue Type: Improvement
Affects Versions: 3.3.1
Environment: Mac OS X 10.6.4
JVM 1.6.0_20
Reporter: Ryan Holmes
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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