Just to clarify: reconnecting to another server will maintain the same session or it will fail with session expires.
ben Flavio Junqueira wrote: > James, I'd like to clarify what exactly is the issue you're looking at. If > you provide a list of ZooKeeper servers, then a client will try to reconnect > to another ZooKeeper server upon a disconnection. Reconnecting to another > server does not guarantee maintaining the same session, though. So, are you > trying to guarantee that the session is still the same upon a reconnection? > If so, I don't think you can do it by just changing the client, since the > servers might have expired the old session. > > Cheers, > -Flavio > > >> -----Original Message----- >> From: James Strachan [mailto:[EMAIL PROTECTED] >> Sent: Tuesday, July 22, 2008 9:09 PM >> To: zookeeper-dev@hadoop.apache.org >> Subject: things lock up when the client reconnects? >> >> I wonder if anyone else has seen this recently; I've been trying to >> make the WriteLock implementation survive server restarts (i.e. >> reconnecting to another ZK server) with some success. See the latest >> patch here... >> https://issues.apache.org/jira/browse/ZOOKEEPER-78 >> >> but I've found I can reliably get things to lock up. See the >> WriteLockTest.java and change the workAroundClosingLastZNodeFails to >> false and you should be able to run the test yourself and see things >> lock up. >> >> It seems like things lock up when waiting on a Packet being sent to >> the transport. Sometimes I get a session timed out exception, so if I >> see that I try and recreate the cxcn object which is maybe causing the >> issue; I tried patching the ClientCnxn.SendThread.close() method to do >> a cleanup() to wake up any blocked threads before closing (its in the >> patch for ZOOKEEPER-78 which also depends on the patch for >> ZOOKEEPER-84 BTW); am wondering if anyone has a better idea of dealing >> with a session timeout? >> >> -- >> James >> ------- >> http://macstrac.blogspot.com/ >> >> Open Source Integration >> http://open.iona.com >> > >