[jboss-dev-forums] [Design of JBoss Collaboration Server] - Re: JBMS Alternate Datastore

[csand101]

acoliver,

Not sure what you are referring to by a non-free HA implementation.  All I see at MySQL.com is info on the MySQL cluster architectur (like the white paper "A Guide to High Availability Clustering: How MySQL Supports 99.999% Availability" and of course the clustering section of the docs).  Each node entry point (MySQL server) has it's own ip.  No mention is made of MySQL servers taking over ips which would require a single MySQL server (the takeover server) to listen to multiple ips at once (not to mention that now one server has to handle twice it's load, even if 5 nodes in cluster).  There is mention however of "applications" failing over to working MySQL nodes which seems like the most sensible solution.  4 nodes split the load of the downed 5th node.

Tell me, how can JBMS be such a great enterprise mail server if it can't failover to another datastore instance, which it relies on to store mail?  There is a single point of failure at the JDBC connection layer, at least for that JBMS node.

And what happens when a JBMS node can't reach it's database?  Does it stop listening for POP3 and SMTP connections (which would at least allow a load balancer in front of the mail server to direct traffic to another JBMS server) or does it just keep listening for connections and replying with errors (requiring multiple MX records so the sending mail server can use a different one)?  Worse yet, it would keep spooling mail and throwing SQLExceptions becasuse the database is gone.

Any light you could shed on this issue, acoliver, would be appreciated... surely by more than just sappenin and I as I don't see any JBMS documentation on this issue.

Also, please correct me if I'm wrong anywhere above.  Especially if it means there is not actually a free HA JBMS solution.

Thank you

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