-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Daniel,
On 1/19/15 9:21 AM, Daniel Mikusa wrote: > I've not personally used memcache, but I have used redis, so I > guess that's a similar approach. Are you using Redis for session persistence? > The technology was a nice fit, but it didn't seem like a huge win > versus the out-of-the-box session replication. Both worked and > both were fast enough for what I needed. I stuck with the > out-of-the-box stuff because it's distributed and replicated by > default and didn't require an extra server. Aah, so you evaluated it and discarded it as an option for sessions because it didn't offer much over what comes with Tomcat? > Where I've mainly used redis is in restricted environments where > direct communication from one node to the other is not possible, > like in some "cloud" environments, or when it's not as easy to > setup like when multicast is disabled. I'm curious because I looked at a handful of packages for this kind of thing (we are storing authentication nonces that need to be accessible from all of our Tomcat servers) and we settled on memcached if only for its simplicity and solid reputation. Some things it cannot do: 1. Replicate to other nodes. You can do sharding, but it's pretty low-brow and the shards don't actually know about each other. All of the smarts are in the client. The server doesn't do any of this. Evidently, there are some flavors of memcached that have been hacked to provide replication to other nodes, but it's not part of the main distribution and didn't seem ... safe. 2. Dump its database to disk. If you restart, you lose everything. 3. Allow you to browse. Basically, if you know an item's key, you can fetch its value. If you don't, you are out of luck. You can't just poke around looking for things. There is no equivalent of "SELECT * LIMIT 5" just to see what's in there. Does Redis do any of the above? Honestly, I think what Tomcat needs is a session manager for Cassandra or something similar: something intended to be a primary data store and not a cache (like memcached is). - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: GPGTools - http://gpgtools.org iQIcBAEBCAAGBQJUvStFAAoJEBzwKT+lPKRYXP8P/iQknECivamRE2+XPH9KSnzh BMwnq1TudZ20qFZbwnxA33Yli4DwEM6Sug7mph+R3iDVgqkR5srMfNeGUciwwFN7 4IUObktVQxg21VbSachilfi2Aat33FYTlmtHf+plDQAr0ig41pOKhujuF6pWWM3V RNJZQgmAivQXgA86RavIaVX+7x4HeB+w8iTYQm6dGbCpTWIADeqBuT358dTKRX+D Ricvs1M7C37LJNCyymKSgKlxAf7MF39viW9lHBsMp45o166vWcAGjj6juNuXDyBD xdk6UbkqbGIQ+No1W20BQZEm7mL8cCq8NYqs6YHwf9rV3v6rP4E0CTH1ubNN4q/K AwWtT5ijP7xA3cPxXEs7XdL6ynsMMJublk2/+V/+ctPE2XP7kfQCMBYhPSiux1Kc ILikydk5u0X0Dudmes4r9g6+wabnR9OC6/lB3c6BRG6kOdbj+VJo+23vbUQZkAHt lCVjjTirrvb6YLXuv+IXUomAlLn7bzQ39M1L1UO5wsRUd2kICnpZ7G5Cs3n5r98B WWSBLvChvez/hnt2HP3PlTBstW06R1Ds9FvkSMtVoO3roQSPEx6b1QCEsnw1NXCL SvAgN43FzXZxOyr+ZohGzUhSELXQI5v7pV6p3Bj+tMrAL/+fzMiS4KoJqDWc7/nB 3NlP1g/7RN1IYnLkFm+q =Po13 -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
