bug?: artemis primary cannnot see secondary

[krancour]

Running in an HA configuration, I see this, repeatedly, in the primary's logs:

2021-11-13 21:12:00,631 ERROR [org.apache.activemq.artemis.core.client] AMQ214033: Cannot resolve host : java.net.UnknownHostException: brigade-artemis-secondary-0.brigade-artemis-secondary.brigade.svc.cluster.local
	at java.net.InetAddress.getAllByName0(InetAddress.java:1281) [rt.jar:1.8.0_312]
	at java.net.InetAddress.getAllByName(InetAddress.java:1193) [rt.jar:1.8.0_312]
	at java.net.InetAddress.getAllByName(InetAddress.java:1127) [rt.jar:1.8.0_312]
	at java.net.InetAddress.getByName(InetAddress.java:1077) [rt.jar:1.8.0_312]
	at org.apache.activemq.artemis.core.remoting.impl.netty.NettyConnector.isSameHostAndPort(NettyConnector.java:1291) [artemis-core-client-2.19.0.jar:2.19.0]
	at org.apache.activemq.artemis.core.remoting.impl.netty.NettyConnector.isEquivalent(NettyConnector.java:1272) [artemis-core-client-2.19.0.jar:2.19.0]
	at org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl.setBackupConnector(ClientSessionFactoryImpl.java:292) [artemis-core-client-2.19.0.jar:2.19.0]
	at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.notifyNodeUp(ServerLocatorImpl.java:1484) [artemis-core-client-2.19.0.jar:2.19.0]
	at org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl$SessionFactoryTopologyHandler.notifyNodeUp(ClientSessionFactoryImpl.java:1497) [artemis-core-client-2.19.0.jar:2.19.0]
	at org.apache.activemq.artemis.core.protocol.core.impl.ActiveMQClientProtocolManager$Channel0Handler.notifyTopologyChange(ActiveMQClientProtocolManager.java:544) [artemis-core-client-2.19.0.jar:2.19.0]
	at org.apache.activemq.artemis.core.protocol.core.impl.ActiveMQClientProtocolManager$Channel0Handler.handlePacket(ActiveMQClientProtocolManager.java:494) [artemis-core-client-2.19.0.jar:2.19.0]
	at org.apache.activemq.artemis.core.protocol.core.impl.ChannelImpl.handlePacket(ChannelImpl.java:820) [artemis-core-client-2.19.0.jar:2.19.0]
	at org.apache.activemq.artemis.core.protocol.core.impl.RemotingConnectionImpl.doBufferReceived(RemotingConnectionImpl.java:428) [artemis-core-client-2.19.0.jar:2.19.0]
	at org.apache.activemq.artemis.core.protocol.core.impl.RemotingConnectionImpl.bufferReceived(RemotingConnectionImpl.java:396) [artemis-core-client-2.19.0.jar:2.19.0]
	at org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl$DelegatingBufferHandler.bufferReceived(ClientSessionFactoryImpl.java:1263) [artemis-core-client-2.19.0.jar:2.19.0]
	at org.apache.activemq.artemis.core.remoting.impl.netty.ActiveMQChannelHandler.channelRead(ActiveMQChannelHandler.java:73) [artemis-core-client-2.19.0.jar:2.19.0]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:795) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:480) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-all-4.1.68.Final.jar:4.1.68.Final]
	at org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:118) [artemis-commons-2.19.0.jar:2.19.0]

I've seen failover work before. Not sure yet what's going on here.

Some experimentation may be in order.