Thanks for your detailed answer, I will probably go with in-memory replication. Regading your last question, I have one database instance sitting on top of a 2 node DRBD.
2009/6/17 Christopher Schultz <ch...@christopherschultz.net>: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Yves, > > On 6/17/2009 6:04 AM, Yves Glodt wrote: >> In my setup are 4 apaches with mod_proxy which connect to 4 tomcats. >> In front of the apaches is a hardware balancer which does >> round-robin, but with a kind of sticky TCP-sessions, so mostly the >> clients on the web stay on the same server. Mostly... > > Why not use mod_jk's session stickiness? The httpd server can be chosen > randomly by the hw lb, but the "right" Tomcat always gets the request. > Then, you can forget about session replication and get better > performance. On the other hand, if your users cannot be expected to > tolerate interruptions (due to a failing server) then you'll /have/ to > go with some kind of replication. > >> To be completely safe and sleep well, I would like to replicate the >> sessions now, and in the mentioned document I read that it is >> possible using the PersistenceManager with JDBCStore. > > Just note that this is probably the slowest of the 3 options presented > in the Replication HOWTO, since each session attribute will have to be > retrieved from the database every time. Option #3 (in-memory > replication) will probably be the fastest option for a cluster such as > yours, especially if all the members of the cluster are on the same > (real) network. > >> My question now: Is it enough to set up PersistenceManager with >> JDBCStore on my 4 tomcats to use the same database/table as session >> store ? > > It should be. > >> Or do I need to mess with ReplicationValve and jvmRoute set up as >> well ? > > No, but I think using "real" replication will give you better performance. > >> I will put my server.xml at the end of the file, which is set up >> with JDBCStore using a Firebird Database with JayBird. > > How are you sharing your database across your 4 Tomcat instances? > > - -chris > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (MingW32) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ > > iEYEARECAAYFAko5RwoACgkQ9CaO5/Lv0PDK/wCffEK2IfLU3urah7UO4c8+NV2w > VOMAn2ly1yE2CO3+PdglPRj2k9plFn5F > =qeVK > -----END PGP SIGNATURE----- > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
