我已经使用 JGroups 创建了 ActiveMQ Artemis (v2.29.0) 集群，并使用发现组启用了 HA 策略作为缩小规模，但它失败了。
经纪人.xml
<acceptors>
<acceptor name="artemis">tcp://0.0.0.0:61616?tcpSendBufferSize=1048576;tcpReceiveBufferSize=1048576;amqpMinLargeMessageSize=102400;protocols=CORE,AMQP,STOMP,HORNETQ,MQTT,OPENWIRE;useEpoll=true;amqpCredits=1000;amqpLowCredits=300;amqpDuplicateDetection=true;supportAdvisory=false;suppressInternalManagementObjects=false</acceptor>
</acceptors>
<connectors>
<connector name="netty-connector">tcp://0.0.0.0:61616</connector>
</connectors>
<broadcast-groups>
<broadcast-group name="my-broadcast-group">
<broadcast-period>5000</broadcast-period>
<jgroups-file>jgroup-file-ping.xml</jgroups-file>
<jgroups-channel>active_broadcast_channel</jgroups-channel>
<connector-ref>netty-connector</connector-ref>
</broadcast-group>
</broadcast-groups>
<discovery-groups>
<discovery-group name="my-discovery-group">
<jgroups-file>jgroup-file-ping.xml</jgroups-file>
<jgroups-channel>active_broadcast_channel</jgroups-channel>
<refresh-timeout>10000</refresh-timeout>
</discovery-group>
</discovery-groups>
<cluster-connections>
<cluster-connection name="my-cluster">
<connector-ref>netty-connector</connector-ref>
<retry-interval>2000</retry-interval>
<use-duplicate-detection>true</use-duplicate-detection>
<message-load-balancing>ON_DEMAND</message-load-balancing>
<max-hops>1</max-hops>
<discovery-group-ref discovery-group-name="my-discovery-group"/>
</cluster-connection>
</cluster-connections>
<ha-policy>
<live-only>
<scale-down>
<enabled>true</enabled>
<discovery-group-ref discovery-group-name="my-discovery-group"/>
</scale-down>
</live-only>
</ha-policy>
jgroup-文件-ping.xml
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="urn:org:jgroups"
xsi:schemaLocation="urn:org:jgroups http://www.jgroups.org/schema/jgroups.xsd">
<TCP bind_addr="${jgroups.bind_addr:site_local}"
bind_port="${jgroups.bind_port:7800}"
external_addr="${jgroups.external_addr}"
external_port="${jgroups.external_port}"
thread_pool.min_threads="0"
thread_pool.max_threads="200"
thread_pool.keep_alive_time="30000"/>
<RED/>
<!-- a location that can be found by both server's running -->
<FILE_PING location="../../file.ping.dir"/>
<MERGE3 min_interval="10000"
max_interval="30000"/>
<FD_SOCK2/>
<FD_ALL3 timeout="40000" interval="5000" />
<VERIFY_SUSPECT2 timeout="1500" />
<BARRIER />
<pbcast.NAKACK2 use_mcast_xmit="false" />
<UNICAST3 />
<pbcast.STABLE desired_avg_gossip="50000"
max_bytes="4M"/>
<pbcast.GMS print_local_addr="true" join_timeout="2000"/>
<UFC max_credits="2M"
min_threshold="0.4"/>
<MFC max_credits="2M"
min_threshold="0.4"/>
<FRAG2 frag_size="60K" />
<!--RSVP resend_interval="2000" timeout="10000"/-->
<pbcast.STATE_TRANSFER/>
</config>
对于其他代理，除了端口之外，配置相同。 当我使用命令
artemis stop我使用连接器进行了检查，它正在工作。
2023-07-31 17:01:15,202 INFO [org.apache.activemq.artemis.core.server] AMQ221029: stopped bridge $.artemis.internal.sf.my-cluster.eef60017-2f81-11ee-adb4-ea6113f38d3a
2023-07-31 17:01:15,295 WARN [org.apache.activemq.artemis.core.server] AMQ222181: Unable to scaleDown messages
org.apache.activemq.artemis.api.core.ActiveMQInternalErrorException: AMQ219004: Failed to initialise session factory
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.initialize(ServerLocatorImpl.java:277) ~[artemis-core-client-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.createSessionFactory(ServerLocatorImpl.java:671) ~[artemis-core-client-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.connect(ServerLocatorImpl.java:570) ~[artemis-core-client-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.connect(ServerLocatorImpl.java:549) ~[artemis-core-client-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.server.LiveNodeLocator.connectToCluster(LiveNodeLocator.java:85) ~[artemis-server-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.server.impl.LiveOnlyActivation.connectToScaleDownTarget(LiveOnlyActivation.java:148) [artemis-server-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.server.impl.LiveOnlyActivation.freezeConnections(LiveOnlyActivation.java:116) [artemis-server-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl.freezeConnections(ActiveMQServerImpl.java:1550) [artemis-server-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl.stop(ActiveMQServerImpl.java:1324) [artemis-server-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl.stop(ActiveMQServerImpl.java:1243) [artemis-server-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl.stop(ActiveMQServerImpl.java:1227) [artemis-server-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl.stop(ActiveMQServerImpl.java:1038) [artemis-server-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.integration.FileBroker.stop(FileBroker.java:94) [artemis-cli-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.cli.commands.Run.stop(Run.java:222) [artemis-cli-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.cli.commands.Run$2.run(Run.java:196) [artemis-cli-2.29.0.jar:2.29.0]
at java.util.TimerThread.mainLoop(Timer.java:566) [?:?]
at java.util.TimerThread.run(Timer.java:516) [?:?]
Caused by: org.apache.activemq.artemis.api.core.ActiveMQInternalErrorException: channel is closed
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.startDiscovery(ServerLocatorImpl.java:291) ~[artemis-core-client-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.initialize(ServerLocatorImpl.java:273) ~[artemis-core-client-2.29.0.jar:2.29.0]
... 16 more
Caused by: java.lang.IllegalStateException: channel is closed
at org.jgroups.JChannel.checkClosed(JChannel.java:983) ~[jgroups-5.2.0.Final.jar:5.2.0.Final]
at org.jgroups.JChannel._preConnect(JChannel.java:792) ~[jgroups-5.2.0.Final.jar:5.2.0.Final]
at org.jgroups.JChannel.connect(JChannel.java:322) ~[jgroups-5.2.0.Final.jar:5.2.0.Final]
at org.jgroups.JChannel.connect(JChannel.java:316) ~[jgroups-5.2.0.Final.jar:5.2.0.Final]
at org.apache.activemq.artemis.api.core.jgroups.JChannelWrapper.connect(JChannelWrapper.java:127) ~[artemis-core-client-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.api.core.JGroupsBroadcastEndpoint.internalOpen(JGroupsBroadcastEndpoint.java:121) ~[artemis-core-client-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.api.core.JGroupsBroadcastEndpoint.openClient(JGroupsBroadcastEndpoint.java:99) ~[artemis-core-client-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.cluster.DiscoveryGroup.start(DiscoveryGroup.java:113) ~[artemis-core-client-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.startDiscovery(ServerLocatorImpl.java:289) ~[artemis-core-client-2.29.0.jar:2.29.0]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.initialize(ServerLocatorImpl.java:273) ~[artemis-core-client-2.29.0.jar:2.29.0]
... 16 more
2023-07-31 17:01:15,485 INFO [org.apache.activemq.artemis] AMQ241005: Stopping embedded web server
2023-07-31 17:01:15,497 INFO [io.hawt.web.auth.AuthenticationFilter] Destroying hawtio authentication filter
2023-07-31 17:01:15,499 INFO [io.hawt.HawtioContextListener] Destroying hawtio services
2023-07-31 17:01:15,530 INFO [org.apache.activemq.hawtio.plugin.PluginContextListener] Destroyed artemis-plugin plugin
2023-07-31 17:01:15,542 INFO [org.apache.activemq.hawtio.branding.PluginContextListener] Destroyed activemq-branding plugin
2023-07-31 17:01:15,568 INFO [org.apache.activemq.artemis] AMQ241006: Stopped embedded web server
2023-07-31 17:01:15,570 INFO [org.apache.activemq.artemis.core.server] AMQ221002: Apache ActiveMQ Artemis Message Broker version 2.29.0 [2df21bb4-24c6-11ee-accf-0adf5b5db694] stopped, uptime 13.875 seconds