Thanks. It's running in a Docker container, so I "docker stop" it. I can see the log output as the slave takes over and starts up, and then I can log into the old slave's ActiveMQ management console. And, I can see that the client detects the down master and attempts reconnects.
Having said that - I've tried a number of variations on what you pointed out - i.e. adding query params to the url. My url looks like this: (tcp://activemq-1:61616,tcp://activemq-2:61616)?ha=true&reconnectAttempts=60&retryInterval=1000 and, when I kill the master's Docker container, my client side code goes into the reconnect logic, and iterates the appropriate number of times to try to reconnect. However - it only ever attempts to reconnect to the original connected server. So - if when I start up my client code 'activemq-1' is the master and 'activemq-2' is the slave, the client connects to 'activemq-1'. When I kill 'activemq-1', the client only attempts reconnecting to 'activemq-1', and doesn't try 'activemq-2'. This is logged to the console (yeah - I know the message says 10 times, and my query reconnectAttempts is set to 60 - I still have a hard override in my code. I'll clean that up before I'm all done...): WARN o.a.activemq.artemis.core.client - AMQ212005: Tried 10 times to connect. Now giving up on reconnecting it. I can see both servers listed in the ' I've tried it with 'activemq-1' being the master and 'activemq-2' being the slave, I've tried it the other way around, and I've tried it with only one server running, and starting up the other once the client has initialized. Same basic problem with each attempt. During the reconnect attempts, I can see (in the debugger) that ClientSessionFactyoryImpl's serverLocator has both 'activemq-1' and 'activemq-2' in the 'initialConnectors' array. This might be a clue. I don't know what the Topology object should look like, but the 'topology' hash map is empty. And, this output when I turned on 'debug' logging for activemq classes: 2019-07-08 21:18:31,883 UTC [main] DEBUG o.a.a.a.c.c.i.ClientSessionFactoryImpl - ClientSessionFactoryImpl received backup update for live/backup pair = TransportConfiguration(name=null:tcp://activemq-2:61616, factory=org-apache-activemq-artemis-core-remoting-impl-netty-NettyConnectorFactory) ?port=61616&host=activemq-2&reconnectAttempts=60&ha=true&retryInterval=1000 / null but it didn't belong to TransportConfiguration(name=null:tcp://activemq-2:61616, factory=org-apache-activemq-artemis-core-remoting-impl-netty-NettyConnectorFactory) ?port=61616&host=activemq-2&reconnectAttempts=60&ha=true&retryInterval=1000 Further - here's the console log debug output for one iteration of attempting to reconnect on the client: 2019-07-08 21:31:48,619 UTC [Thread-2 (ActiveMQ-client-global-threads)] DEBUG o.a.a.a.c.r.i.netty.NettyConnector - Connector NettyConnector [host=activemq-2, port=61616, httpEnabled=false, httpUpgradeEnabled=false, useServlet=false, servletPath=/messaging/ActiveMQServlet, sslEnabled=false, useNio=true] using native epoll 2019-07-08 21:31:48,620 UTC [Thread-2 (ActiveMQ-client-global-threads)] DEBUG o.a.activemq.artemis.core.client - AMQ211002: Started EPOLL Netty Connector version 4.1.31.Final to activemq-2:61616 2019-07-08 21:31:48,625 UTC [Thread-2 (ActiveMQ-client-global-threads)] DEBUG o.a.a.a.c.r.i.netty.NettyConnector - Remote destination: activemq-2/10.5.85.142:61616 2019-07-08 21:31:49,896 UTC [Thread-2 (ActiveMQ-client-global-threads)] DEBUG o.a.a.a.c.c.i.ClientSessionFactoryImpl - Connector towards NettyConnector [host=activemq-2, port=61616, httpEnabled=false, httpUpgradeEnabled=false, useServlet=false, servletPath=/messaging/ActiveMQServlet, sslEnabled=false, useNio=true] failed 2019-07-08 21:31:49,899 UTC [Thread-2 (ActiveMQ-client-global-threads)] DEBUG o.a.a.a.c.c.i.ClientSessionFactoryImpl - Backup is not active, trying original connection configuration now. 2019-07-08 21:31:50,901 UTC [Thread-2 (ActiveMQ-client-global-threads)] DEBUG o.a.a.a.c.c.i.ClientSessionFactoryImpl - Trying reconnection attempt 1/10 2019-07-08 21:31:50,902 UTC [Thread-2 (ActiveMQ-client-global-threads)] DEBUG o.a.a.a.c.c.i.ClientSessionFactoryImpl - Trying to connect with connectorFactory = org.apache.activemq.artemis.core.remoting.impl.netty.NettyConnectorFactory@31973858, connectorConfig=TransportConfiguration(name=null:tcp://activemq-2:61616, factory=org-apache-activemq-artemis-core-remoting-impl-netty-NettyConnectorFactory) ?port=61616&host=activemq-2&reconnectAttempts=60&ha=true&retryInterval=1000 where I see "Backup is not active, trying original connection configuration now." (Sorry - I inherited the ActiveMQ master / backup setup from another engineer who isn't with the company any more - and I suspect from the above that it might not be set up correctly?) Thanks! Any thoughts? Thanks! -- Sent from: http://activemq.2283324.n4.nabble.com/ActiveMQ-User-f2341805.html
