ActiveMQ 5.x does not have the ability to write to multiple persistence stores at once, so this is not possible in ActiveMQ 5.x using a single broker. Depending on your requirements, it might or might not be possible using multiple brokers.
Most people who ask about failover mean that persistent messages sent to broker A are available to be picked up seamlessly (and in order) by broker B when it takes over, and then messages sent to B while A are down are available to A if it takes back over as the master. If that's what you mean, then no, this is not possible in ActiveMQ 5.x. Artemis might be able to do something like this since I believe they support in-cluster replication, but I'm not an expert on Artemis so I defer to those who are. If what you mean is instead simply that clients can send and receive new messages via the new broker, but you're willing to accept the unavailability of messages in A when A goes down (until it comes back up), that's possible. You would configure A to use MySQL and B to use KahaDB, and have all clients use a failover transport URI that prioritized A over B (via randomize=false and the priorityBackup feature). If you wanted to ensure that messages sent to B while A is down are not stranded when everyone abandons B to go back to A, you could use a networkConnector to connect A and B in a Network of Brokers configuration, but if you're willing to accept losing those messages (and a period of partial degradation between when A comes back up and when the last consumer on B detects that A is available and fails back to it), you can just make A and B completely standalone brokers. Tim On Sat, May 6, 2017 at 1:08 PM, racarlson <racarl...@mediacomcc.com> wrote: > we use mysql with activemq cluster. I can configure it to work with c3p0 > when > db is down and retry but I would like to have activemq failover to kahadb > when database is down. Is this possible? > > > > -- > View this message in context: http://activemq.2283324.n4. > nabble.com/is-it-possible-to-have-activemq-failover-to- > kahadb-if-mysql-is-down-tp4725724.html > Sent from the ActiveMQ - User mailing list archive at Nabble.com. >
