Here's the implementation in the HBase source repository that Ted pointed out:
http://svn.apache.org/viewvc/hbase/trunk/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.java?view=markup Jérémie On Mon, Nov 28, 2011 at 5:29 PM, Olivier Van Acker <cyberroa...@gmail.com> wrote: >> >> >> failure modes. This is the primary reason that I prefer the single file >> leader election method. >> > > What is single file leader election? A quick search on google didn't come > up with any results :-( > > Olivier > > > > >> >> On Fri, Nov 25, 2011 at 10:17 PM, Jordan Zimmerman >> <jzimmer...@netflix.com>wrote: >> >> > A few comments: >> > >> > * NodeMonitor.createRootIfNotExists() should catch NodeExists. In the >> case >> > of multiple clients, this is a possibility. >> > >> > * I'd add a start method and create the ZooKeeper instance there. This >> > gives users a chance to set a listener so as to receive all messages. >> > >> > * All ZooKeeper operations should be in some kind of retry loop. The >> > client can lose connection to a given server but successfully reconnect >> to >> > another one in the cluster. >> > >> > * When creating the Znode, it can succeed on the server but fail to >> return >> > the result to the client. On a Disconnect/Session exception, you should >> > retry and then call getChildren and search for your node. >> > >> > -JZ >> > >> > On 11/25/11 2:45 AM, "Olivier Van Acker" <cyberroa...@gmail.com> wrote: >> > >> > >I've written a example app on how to do implement leadership election in >> > >with zookeeper >> > >Is there anyone on the list who'd like to review my app and if it needs >> > >improvement or not? >> > > >> > >the app is on github: >> > >https://github.com/cyberroadie/zookeeper-leader >> > > >> > >and explained how it works on my blog: >> > > >> > >> http://cyberroadie.wordpress.com/2011/11/24/implementing-leader-election-w >> > >ith-zookeeper/ >> > > >> > >Olivier >> > >> > >> > -- Jérémie 'ahFeel' BORDIER
