GitHub user RongtongJin added a comment to the discussion:
docker部署5.1.1版本的controller模式，跨主机的broker主从不同步，也无法自动切换
> **环境：**
>
> 1. 2台虚机：hostA 194.0.11.118、hostB 194.0.11.119
> 2. docker镜像：apache/rocketmq:5.1.1
> 3. hostA部署: nameserver+controller 3容器 + 2broker
>
> ```
> #ControllerGroup RaftGroup
> #ControllerLeaderId n1
> #ControllerLeaderAddress 194.0.11.118:10082
> #Peer: n0:194.0.11.118:10081
> #Peer: n1:194.0.11.118:10082
> #Peer: n2:194.0.11.118:10083
> ```
>
> 4. hostB部署: 1broker
>
> **现象：**
>
> ```
> #brokerName broker-a
> #MasterBrokerId 1
> #MasterAddr 194.0.11.118:10111
> #MasterEpoch 3
> #SyncStateSetEpoch 6
> #SyncStateSetNums 2
>
> InSyncReplica: ReplicaIdentity{brokerName='broker-a', brokerId=1,
> brokerAddress='194.0.11.118:10111', alive=true}
> InSyncReplica: ReplicaIdentity{brokerName='broker-a', brokerId=2,
> brokerAddress='194.0.11.118:10211', alive=true}
> NotInSyncReplica: ReplicaIdentity{brokerName='broker-a', brokerId=3,
> brokerAddress='194.0.11.119:10311', alive=true}
> ```
>
> ```
> #clusterName DCluster
> #brokerName broker-a
> #brokerAddr 194.0.11.118:10111
> #brokerId 0
> #Epoch: EpochEntry{epoch=1, startOffset=0, endOffset=0}
>
> #clusterName DCluster
> #brokerName broker-a
> #brokerAddr 194.0.11.119:10311
> #brokerId 3
>
> #clusterName DCluster
> #brokerName broker-a
> #brokerAddr 194.0.11.118:10211
> #brokerId 2
> #Epoch: EpochEntry{epoch=1, startOffset=0, endOffset=0}
> ```
>
> 本来是hostA和hostB各自部署一个broker，作为主从，但hostB的broker一直无法加入SyncStateSet，导致主从无法同步，也就无法自动切换主从
>
> 不确定是否有关的报错信息：
>
> ```
> ERROR FlowMonitor - Interrupted
> java.lang.InterruptedException: null
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1039)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1328)
> at
> org.apache.rocketmq.common.CountDownLatch2.await(CountDownLatch2.java:114)
> at
> org.apache.rocketmq.common.ServiceThread.waitForRunning(ServiceThread.java:117)
> at org.apache.rocketmq.store.ha.FlowMoni
> ```
>
> ```
> ERROR NettyServerCodecThread_3 - decode exception, 194.0.11.118:38438
> io.netty.handler.codec.TooLongFrameException: Adjusted frame length exceeds
> 16777216: 1195725860 - discarded
> at
> io.netty.handler.codec.LengthFieldBasedFrameDecoder.fail(LengthFieldBasedFrameDecoder.java:503)
> at
> io.netty.handler.codec.LengthFieldBasedFrameDecoder.failIfNecessary(LengthFieldBasedFrameDecoder.java:489)
> ```
>
> 194.0.11.118:38438 这端口是随机生成的？容器没映射端口肯定不通
>
> 尝试在hostA中再部署一个broker容器后，又发现新的broker可以正常加入SyncStateSet，主从切换也正常。
>
> **怀疑：** brokerIP1都有配成宿主机的IP，但broker间的通信是否走容器的私有IP，这样就能解释同一台的容器通信正常，跨主机的通信失败
> 大家是否有碰到同样问题的？有什么方法可以查看或验证broker间的通信是否正常？
broker间的通信会利用到brokerIP2，这个是否配置成宿主机IP？
GitHub link:
https://github.com/apache/rocketmq/discussions/6914#discussioncomment-6202874
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