I have some applications currently using sticky sessions in tomcat 7. Everything works well except that restarting tomcat requires disabling mod_jk new sessions to an instance, waiting for sessions to expire and then several hours later restarting the instance. This process is slow and not resilient to unexpected failures.
So I want to persist sessions and allow session failure in the cluster. It appears that I have several approaches: * JDBC * memcache [1] * DeltaManager * BackupManager I discounted JDBC quite quickly because I don't want to add any load to my existing database. DeltaManager seems simple, but I'm weary of sending lots of data to all the nodes in my cluster (there are 12) which aren't even running the application. So BackupManager seems better for my needs. However the documentation [2] suggests that BackupManager may not be as reliable. Question 1: Is the documentation still correct after all these years of BackupManager being used? Is it still considered of lower reliability? My next decision is between memcache and BackupManager/DeltaManager. memcache will require another service to be running, so slightly more maintenance and one more thing to fail. However memcache seems to be very commonly used and I'm not sure why. Are there benefits it will bring to this arrangement (such as visibility of live sessions in some sort of GUI) or something else I'm not seeing. Question 2: Are there advantages to running memcache as a session store? I'll be continuing to use sticky sessions since I think that will be more reliable (the system will survive the failure of the session store/replication, whatever I choose). Thanks for any advice Ari [1] https://code.google.com/p/memcached-session-manager/ [2] http://tomcat.apache.org/tomcat-7.0-doc/cluster-howto.html -- --------------------------> Aristedes Maniatis ish http://www.ish.com.au Level 1, 30 Wilson Street Newtown 2042 Australia phone +61 2 9550 5001 fax +61 2 9550 4001 GPG fingerprint CBFB 84B4 738D 4E87 5E5C 5EFA EF6A 7D2E 3E49 102A --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
