The client library is in charge of preventing expirations, if it happens it is probably because of dead servers or network problems that caused a spike in latency.
Increasing your session timeout helps prevent this. If/when it happens, you need create another ZooKeeper object to reconnect to ZooKeeper. If you had any ephemeral nodes, they will be gone. For applications that are just reading things from ZooKeeper or updating status znodes the recovery is very simple. For master applications that setup complex ZooKeeper subtrees with ephemeral znodes at initialization, they need to rerun initialization logic. From ZooKeeper's point of view, the application has restarted when a new ZooKeeper object is recreated. ben On Tuesday 17 June 2008 00:34:58 Avinash Lakshman wrote: > How do prevent my session from timing out? I get this exception: > > Priming connection to java.nio.channels.SocketChannel[connected local=/ > 10.16.138.101:8352 remote=fool.xyz.com/10.18.39.211:5001] > WARN - Closing: > java.io.IOException: Session Expired > at > com.yahoo.zookeeper.ClientCnxn$SendThread.readConnectResult(ClientCnxn.java >:406) at > com.yahoo.zookeeper.ClientCnxn$SendThread.doIO(ClientCnxn.java:492) > at > com.yahoo.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:705) > ERROR - from SendThread > java.lang.NoSuchMethodError: org.apache.log4j.Logger.isTraceEnabled()Z > at > com.yahoo.zookeeper.server.ZooTrace.isTraceEnabled(ZooTrace.java:63) > at > com.yahoo.zookeeper.server.ZooTrace.logTraceMessage(ZooTrace.java:67) > at > com.yahoo.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:732) > > Why would this happen and how can I prevent this from happening? How should > the software react to this situation?: > > Avinash ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Zookeeper-user mailing list Zookeeper-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/zookeeper-user
