Re: Client reconnection after a connection loss
Thanks for your help Patrick. I'm already having a look at it. Julien Hi Julien, take a look at the FAQ for some background: http://wiki.apache.org/hadoop/ZooKeeper/FAQ#A3 Basically when your client connects to the server it provides a "timeout" value. If the server doesn't hear from your client within this timeout period (we do heartbeating for you in a background thread, you don't have to worry about this) then it will expire the session. http://hadoop.apache.org/zookeeper/docs/current/zookeeperProgrammers.html#ch_zkSessions You have a watcher for the session - it will be notified both on disconnect but also when/if the session is expired. An expired session is invalid, if this happens you have to create a new session. This is different from a disconnect notification, where you just wait for the client library to reconnect you to the cluster (say you lose connectivity to the server) Patrick On 04/21/2010 01:44 AM, Julien Vey wrote: Hi all, I'm currently working with ZooKeeper in CXF D-OSGI and i'm facing a problem that would require your help. When a client is connected to the ZooKeeper server, and the connection is lost, it throws a ConnectionLossException. The problem is when the connection is back, the client doesn't reconnect itself. I can see the following trace on the server 2010-04-20 17:44:21,526 - INFO [NIOServerCxn.Factory:> 0.0.0.0/0.0.0.0:2181:nioservercnxn$fact...@251] - Accepted socket connection from /129.183.128.230:60471 2010-04-20 17:44:21,526 - INFO [NIOServerCxn.Factory: 0.0.0.0/0.0.0.0:2181:nioserverc...@742] - Client attempting to renew session0x1281ba54e95 at /129.183.128.230:60471 2010-04-20 17:44:21,527 - INFO [NIOServerCxn.Factory: 0.0.0.0/0.0.0.0:2181:nioserverc...@1424] - Invalid session 0x1281ba54e95 for client /129.183.128.230:60471, probably expired 2010-04-20 17:44:21,527 - INFO [NIOServerCxn.Factory: 0.0.0.0/0.0.0.0:2181:nioserverc...@1286] - Closed socket connection for client /129.183.128.230:60471 which had sessionid 0x1281ba54e95 The client tries to reconnect with an expired session id. Is it possible to configure zookeeper in order that it accepts this connection by recreating a new session, or maybe something else that would make the reconnection works ? Thanks in advance for your help Julien.
Re: Client reconnection after a connection loss
Hi Julien, take a look at the FAQ for some background: http://wiki.apache.org/hadoop/ZooKeeper/FAQ#A3 Basically when your client connects to the server it provides a "timeout" value. If the server doesn't hear from your client within this timeout period (we do heartbeating for you in a background thread, you don't have to worry about this) then it will expire the session. http://hadoop.apache.org/zookeeper/docs/current/zookeeperProgrammers.html#ch_zkSessions You have a watcher for the session - it will be notified both on disconnect but also when/if the session is expired. An expired session is invalid, if this happens you have to create a new session. This is different from a disconnect notification, where you just wait for the client library to reconnect you to the cluster (say you lose connectivity to the server) Patrick On 04/21/2010 01:44 AM, Julien Vey wrote: Hi all, I'm currently working with ZooKeeper in CXF D-OSGI and i'm facing a problem that would require your help. When a client is connected to the ZooKeeper server, and the connection is lost, it throws a ConnectionLossException. The problem is when the connection is back, the client doesn't reconnect itself. I can see the following trace on the server 2010-04-20 17:44:21,526 - INFO [NIOServerCxn.Factory:> 0.0.0.0/0.0.0.0:2181:nioservercnxn$fact...@251] - Accepted socket connection from /129.183.128.230:60471 2010-04-20 17:44:21,526 - INFO [NIOServerCxn.Factory: 0.0.0.0/0.0.0.0:2181:nioserverc...@742] - Client attempting to renew session0x1281ba54e95 at /129.183.128.230:60471 2010-04-20 17:44:21,527 - INFO [NIOServerCxn.Factory: 0.0.0.0/0.0.0.0:2181:nioserverc...@1424] - Invalid session 0x1281ba54e95 for client /129.183.128.230:60471, probably expired 2010-04-20 17:44:21,527 - INFO [NIOServerCxn.Factory: 0.0.0.0/0.0.0.0:2181:nioserverc...@1286] - Closed socket connection for client /129.183.128.230:60471 which had sessionid 0x1281ba54e95 The client tries to reconnect with an expired session id. Is it possible to configure zookeeper in order that it accepts this connection by recreating a new session, or maybe something else that would make the reconnection works ? Thanks in advance for your help Julien.
Re: Client reconnection after a connection loss
so far as I know, you should keep an eye on your client handler and reconnect to Zookeeper server when it is expired youself. It's the solution in my application for this kind of situation. On Wed, Apr 21, 2010 at 4:44 PM, Julien Vey wrote: > Hi all, > > I'm currently working with ZooKeeper in CXF D-OSGI and i'm facing a problem > that would require your help. > > When a client is connected to the ZooKeeper server, and the connection is > lost, it throws a ConnectionLossException. > The problem is when the connection is back, the client doesn't reconnect > itself. I can see the following trace on the server > > 2010-04-20 17:44:21,526 - INFO [NIOServerCxn.Factory:> > 0.0.0.0/0.0.0.0:2181:nioservercnxn$fact...@251] - Accepted socket > connection from /129.183.128.230:60471 > 2010-04-20 17:44:21,526 - INFO [NIOServerCxn.Factory: > 0.0.0.0/0.0.0.0:2181:nioserverc...@742] - Client attempting to renew > session0x1281ba54e95 at /129.183.128.230:60471 > 2010-04-20 17:44:21,527 - INFO [NIOServerCxn.Factory: > 0.0.0.0/0.0.0.0:2181:nioserverc...@1424] - Invalid session > 0x1281ba54e95 for client /129.183.128.230:60471, probably expired > 2010-04-20 17:44:21,527 - INFO [NIOServerCxn.Factory: > 0.0.0.0/0.0.0.0:2181:nioserverc...@1286] - Closed socket connection for > client /129.183.128.230:60471 which had sessionid 0x1281ba54e95 > > The client tries to reconnect with an expired session id. > Is it possible to configure zookeeper in order that it accepts this > connection by recreating a new session, or maybe something else that would > make the reconnection works ? > > Thanks in advance for your help > > Julien. > > > > -- With Regards! Ye, Qian
Client reconnection after a connection loss
Hi all, I'm currently working with ZooKeeper in CXF D-OSGI and i'm facing a problem that would require your help. When a client is connected to the ZooKeeper server, and the connection is lost, it throws a ConnectionLossException. The problem is when the connection is back, the client doesn't reconnect itself. I can see the following trace on the server 2010-04-20 17:44:21,526 - INFO [NIOServerCxn.Factory:> 0.0.0.0/0.0.0.0:2181:nioservercnxn$fact...@251] - Accepted socket connection from /129.183.128.230:60471 2010-04-20 17:44:21,526 - INFO [NIOServerCxn.Factory: 0.0.0.0/0.0.0.0:2181:nioserverc...@742] - Client attempting to renew session0x1281ba54e95 at /129.183.128.230:60471 2010-04-20 17:44:21,527 - INFO [NIOServerCxn.Factory: 0.0.0.0/0.0.0.0:2181:nioserverc...@1424] - Invalid session 0x1281ba54e95 for client /129.183.128.230:60471, probably expired 2010-04-20 17:44:21,527 - INFO [NIOServerCxn.Factory: 0.0.0.0/0.0.0.0:2181:nioserverc...@1286] - Closed socket connection for client /129.183.128.230:60471 which had sessionid 0x1281ba54e95 The client tries to reconnect with an expired session id. Is it possible to configure zookeeper in order that it accepts this connection by recreating a new session, or maybe something else that would make the reconnection works ? Thanks in advance for your help Julien.
