Having had problems with 5.1.0 I switched to 4.1.2 and am getting these issues with 4.1.2.
(1) ERROR TransportConnector - Could not accept connection : java.net.SocketException: Too many open files java.net.SocketException: Too many open files at java.net.PlainSocketImpl.socketAccept(Native Method) at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384) at java.net.ServerSocket.implAccept(ServerSocket.java:453) at java.net.ServerSocket.accept(ServerSocket.java:421) at org.apache.activemq.transport.tcp.TcpTransportServer.run(TcpTransportServer.java:153) at java.lang.Thread.run(Thread.java:619) (2) WARN JDBCPersistenceAdapter - Old message cleanup failed due to: SQL Exception: A lock could not be obtained within the time requested WARN TransportConnection - Failed to remove consumer: ID:gbprd01-gs-con02.complinet.com-53034-1208880551977-0:0:9:1. Reason: java.lang.OutOfMemoryError: GC overhead limit exceeded java.lang.OutOfMemoryError: GC overhead limit exceeded WARN JDBCPersistenceAdapter - Old message cleanup failed due to: SQL Exception: A lock could not be obtained within the time requested WARN ManagedTransportConnection - Failed to register MBean: org.apache.activemq:BrokerName=broker2,Type=Connection,ConnectorName=openwire,Connection=ID_gbprd01-gs-con01.complinet.com-41163-1208880295517-2_0 WARN ManagedRegionBroker - Failed to register MBean: org.apache.activemq:BrokerName=broker2,Type=Subscription,persistentMode=Non-Durable,destinationType=Queue,destinationName=deploy-queue,clientId=ID_gbprd01-gs-con02.complinet.com-53034-1208880551977-2_0,consumerId=ID_gbprd01-gs-con02.complinet.com-53034-1208880551977-0_0_9_1 WARN AbstractRegion - A duplicate subscription was detected. Clients may be misbehaving. Later warnings you may see about subscription removal are a consequence of this. I am sending 1.5million messages through a single broker with failover to another broker and two consumers on the first broker. The first one I will address by increasing open file limit. The second I have no idea about. Is that derby falling over? Thanks.