JanYork opened a new issue, #742:
URL: https://github.com/apache/rocketmq-clients/issues/742

   ### Before Creating the Bug Report
   
   - [X] I found a bug, not just asking a question, which should be created in 
[GitHub Discussions](https://github.com/apache/rocketmq-clients/discussions).
   
   - [X] I have searched the [GitHub 
Issues](https://github.com/apache/rocketmq-clients/issues) and [GitHub 
Discussions](https://github.com/apache/rocketmq-clients/discussions)  of this 
repository and believe that this is not a duplicate.
   
   - [X] I have confirmed that this bug belongs to the current repository, not 
other repositories of RocketMQ.
   
   
   ### Programming Language of the Client
   
   Java
   
   ### Runtime Platform Environment
   
   Macos、JDK17
   
   ### RocketMQ Version of the Client/Server
   
   RocketMQ Server Version:5.2.0
   
   RocketMQ Client Version:rocketmq-client-java 5.0.6
   
   ### Run or Compiler Version
   
   JDK17
   
   ### Describe the Bug
   
   Using the `rocketmq-client-java` `SDK` to send message production requests 
to `RocketMQ`, the following error occurs:
   
   ```sh
   Exception in thread "main" java.lang.IllegalStateException: Expected the 
service ProducerImpl-0 [FAILED] to be RUNNING, but the service has FAILED
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.AbstractService.checkCurrentState(AbstractService.java:381)
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.AbstractService.awaitRunning(AbstractService.java:305)
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.AbstractIdleService.awaitRunning(AbstractIdleService.java:165)
        at 
org.apache.rocketmq.client.java.impl.producer.ProducerBuilderImpl.build(ProducerBuilderImpl.java:93)
        at 
com.example.springdemo.mq.ProducerSingleton.buildProducer(ProducerSingleton.java:52)
        at 
com.example.springdemo.mq.ProducerSingleton.getInstance(ProducerSingleton.java:59)
        at 
com.example.springdemo.mq.MessageProducer.main(MessageProducer.java:25)
   Caused by: java.util.concurrent.ExecutionException: 
org.apache.rocketmq.shaded.io.grpc.StatusRuntimeException: UNAVAILABLE: Network 
closed for unknown reason
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.AbstractFuture.getDoneValue(AbstractFuture.java:588)
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:567)
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.FluentFuture$TrustedFuture.get(FluentFuture.java:91)
        at 
org.apache.rocketmq.client.java.impl.ClientImpl.startUp(ClientImpl.java:188)
        at 
org.apache.rocketmq.client.java.impl.producer.ProducerImpl.startUp(ProducerImpl.java:114)
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.AbstractIdleService$DelegateService$1.run(AbstractIdleService.java:62)
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.Callables.lambda$threadRenaming$3(Callables.java:103)
        at java.base/java.lang.Thread.run(Thread.java:840)
   Caused by: org.apache.rocketmq.shaded.io.grpc.StatusRuntimeException: 
UNAVAILABLE: Network closed for unknown reason
        at 
org.apache.rocketmq.shaded.io.grpc.Status.asRuntimeException(Status.java:539)
        at 
org.apache.rocketmq.shaded.io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:544)
        at 
org.apache.rocketmq.shaded.io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
        at 
org.apache.rocketmq.shaded.io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
        at 
org.apache.rocketmq.shaded.io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
        at 
org.apache.rocketmq.shaded.io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:563)
        at 
org.apache.rocketmq.shaded.io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:70)
        at 
org.apache.rocketmq.shaded.io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:744)
        at 
org.apache.rocketmq.shaded.io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:723)
        at 
org.apache.rocketmq.shaded.io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
        at 
org.apache.rocketmq.shaded.io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:133)
        at 
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
        at 
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
        ... 1 more
   ```
   
   Error log from `namesrv.log`:
   ```sh
   2024-05-02 14:40:57 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:00 INFO NettyServerCodecThread_8 - NETTY SERVER PIPELINE: 
channelRegistered 172.19.0.2:38410
   2024-05-02 14:41:00 INFO NettyServerCodecThread_8 - NETTY SERVER PIPELINE: 
channelActive, the channel[172.19.0.2:38410]
   2024-05-02 14:41:00 INFO NettyServerCodecThread_8 - NETTY SERVER PIPELINE: 
channelInactive, the channel[172.19.0.2:38410]
   2024-05-02 14:41:00 INFO NettyServerCodecThread_8 - NETTY SERVER PIPELINE: 
channelUnregistered, the channel[172.19.0.2:38410]
   2024-05-02 14:41:02 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:07 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:12 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:17 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:22 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:27 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:27 INFO NettyServerCodecThread_1 - NETTY SERVER PIPELINE: 
channelRegistered 192.168.65.1:58493
   2024-05-02 14:41:27 INFO NettyServerCodecThread_1 - NETTY SERVER PIPELINE: 
channelActive, the channel[192.168.65.1:58493]
   2024-05-02 14:41:27 ERROR NettyServerCodecThread_1 - decode exception, 
192.168.65.1:58493
   io.netty.handler.codec.TooLongFrameException: Adjusted frame length exceeds 
16777216: 1347569956 - discarded
        at 
io.netty.handler.codec.LengthFieldBasedFrameDecoder.fail(LengthFieldBasedFrameDecoder.java:503)
        at 
io.netty.handler.codec.LengthFieldBasedFrameDecoder.failIfNecessary(LengthFieldBasedFrameDecoder.java:489)
        at 
io.netty.handler.codec.LengthFieldBasedFrameDecoder.exceededFrameLength(LengthFieldBasedFrameDecoder.java:376)
        at 
io.netty.handler.codec.LengthFieldBasedFrameDecoder.decode(LengthFieldBasedFrameDecoder.java:419)
        at 
org.apache.rocketmq.remoting.netty.NettyDecoder.decode(NettyDecoder.java:44)
        at 
io.netty.handler.codec.LengthFieldBasedFrameDecoder.decode(LengthFieldBasedFrameDecoder.java:332)
        at 
io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507)
        at 
io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446)
        at 
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingServer$TlsModeHandler.channelRead0(NettyRemotingServer.java:543)
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingServer$TlsModeHandler.channelRead0(NettyRemotingServer.java:490)
        at 
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:99)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
        at 
io.netty.handler.codec.ByteToMessageDecoder.handlerRemoved(ByteToMessageDecoder.java:253)
        at 
io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:514)
        at 
io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446)
        at 
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
        at 
io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:61)
        at 
io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:370)
        at 
io.netty.util.concurrent.DefaultEventExecutor.run(DefaultEventExecutor.java:66)
        at 
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
        at 
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:41:27 INFO NettyServerNIOSelector_2 - closeChannel: close the 
connection to remote address[192.168.65.1:58493] result: true
   2024-05-02 14:41:27 INFO NettyServerCodecThread_1 - NETTY SERVER PIPELINE: 
channelInactive, the channel[192.168.65.1:58493]
   2024-05-02 14:41:27 INFO NettyServerCodecThread_1 - NETTY SERVER PIPELINE: 
channelUnregistered, the channel[192.168.65.1:58493]
   2024-05-02 14:41:30 INFO NettyServerCodecThread_2 - NETTY SERVER PIPELINE: 
channelRegistered 172.19.0.2:47458
   2024-05-02 14:41:30 INFO NettyServerCodecThread_2 - NETTY SERVER PIPELINE: 
channelActive, the channel[172.19.0.2:47458]
   2024-05-02 14:41:30 WARN RemotingExecutorThread_10 - 
getAllTopicListFromNameserver /172.19.0.2:47458 enable true
   2024-05-02 14:41:32 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:37 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:40 INFO NettyServerCodecThread_2 - NETTY SERVER PIPELINE: 
channelInactive, the channel[172.19.0.2:47458]
   2024-05-02 14:41:40 INFO NettyServerCodecThread_2 - NETTY SERVER PIPELINE: 
channelUnregistered, the channel[172.19.0.2:47458]
   2024-05-02 14:41:42 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:47 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:52 INFO NettyServerCodecThread_3 - NETTY SERVER PIPELINE: 
channelRegistered 192.168.65.1:58530
   2024-05-02 14:41:52 INFO NettyServerCodecThread_3 - NETTY SERVER PIPELINE: 
channelActive, the channel[192.168.65.1:58530]
   2024-05-02 14:41:52 ERROR NettyServerCodecThread_3 - decode exception, 
192.168.65.1:58530
   io.netty.handler.codec.TooLongFrameException: Adjusted frame length exceeds 
16777216: 1347569956 - discarded
        at 
io.netty.handler.codec.LengthFieldBasedFrameDecoder.fail(LengthFieldBasedFrameDecoder.java:503)
        at 
io.netty.handler.codec.LengthFieldBasedFrameDecoder.failIfNecessary(LengthFieldBasedFrameDecoder.java:489)
        at 
io.netty.handler.codec.LengthFieldBasedFrameDecoder.exceededFrameLength(LengthFieldBasedFrameDecoder.java:376)
        at 
io.netty.handler.codec.LengthFieldBasedFrameDecoder.decode(LengthFieldBasedFrameDecoder.java:419)
        at 
org.apache.rocketmq.remoting.netty.NettyDecoder.decode(NettyDecoder.java:44)
        at 
io.netty.handler.codec.LengthFieldBasedFrameDecoder.decode(LengthFieldBasedFrameDecoder.java:332)
        at 
io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507)
        at 
io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446)
        at 
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingServer$TlsModeHandler.channelRead0(NettyRemotingServer.java:543)
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingServer$TlsModeHandler.channelRead0(NettyRemotingServer.java:490)
        at 
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:99)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
        at 
io.netty.handler.codec.ByteToMessageDecoder.handlerRemoved(ByteToMessageDecoder.java:253)
        at 
io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:514)
        at 
io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446)
        at 
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
        at 
io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:61)
        at 
io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:370)
        at 
io.netty.util.concurrent.DefaultEventExecutor.run(DefaultEventExecutor.java:66)
        at 
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
        at 
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:41:52 INFO NettyServerNIOSelector_1 - closeChannel: close the 
connection to remote address[192.168.65.1:58530] result: true
   2024-05-02 14:41:52 INFO NettyServerCodecThread_3 - NETTY SERVER PIPELINE: 
channelInactive, the channel[192.168.65.1:58530]
   2024-05-02 14:41:52 INFO NettyServerCodecThread_3 - NETTY SERVER PIPELINE: 
channelUnregistered, the channel[192.168.65.1:58530]
   2024-05-02 14:41:52 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:57 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:41:59 WARN NettyClientWorkerThread_3 - NETTY CLIENT PIPELINE: 
IDLE exception [172.19.0.3:9876]
   2024-05-02 14:41:59 INFO NettyClientWorkerThread_3 - closeChannel: the 
channel[172.19.0.3:9876] was removed from channel table
   2024-05-02 14:41:59 INFO NettyClientWorkerThread_3 - NETTY CLIENT PIPELINE: 
CLOSE 172.19.0.3:9876
   2024-05-02 14:41:59 INFO NettyClientWorkerThread_3 - eventCloseChannel: the 
channel[null] has been removed from the channel table before
   2024-05-02 14:41:59 INFO NettyClientSelector_1 - closeChannel: close the 
connection to remote address[172.19.0.3:9876] result: true
   2024-05-02 14:41:59 INFO NettyClientWorkerThread_3 - NETTY CLIENT PIPELINE: 
channelInactive, the channel[172.19.0.3:9876]
   2024-05-02 14:41:59 INFO NettyClientWorkerThread_3 - eventCloseChannel: the 
channel[null] has been removed from the channel table before
   2024-05-02 14:41:59 INFO NettyServerCodecThread_5 - NETTY SERVER PIPELINE: 
channelInactive, the channel[172.19.0.3:55644]
   2024-05-02 14:41:59 INFO NettyServerCodecThread_5 - NETTY SERVER PIPELINE: 
channelUnregistered, the channel[172.19.0.3:55644]
   2024-05-02 14:42:00 INFO NettyServerCodecThread_4 - NETTY SERVER PIPELINE: 
channelRegistered 172.19.0.2:45844
   2024-05-02 14:42:00 INFO NettyServerCodecThread_4 - NETTY SERVER PIPELINE: 
channelActive, the channel[172.19.0.2:45844]
   2024-05-02 14:42:00 INFO NettyServerCodecThread_4 - NETTY SERVER PIPELINE: 
channelInactive, the channel[172.19.0.2:45844]
   2024-05-02 14:42:00 INFO NettyServerCodecThread_4 - NETTY SERVER PIPELINE: 
channelUnregistered, the channel[172.19.0.2:45844]
   2024-05-02 14:42:00 INFO NettyClientScan_thread_2 - createChannel: begin to 
connect remote host[172.19.0.3:9876] asynchronously
   2024-05-02 14:42:00 INFO NettyClientWorkerThread_4 - NETTY CLIENT PIPELINE: 
CONNECT  UNKNOWN => 172.19.0.3:9876
   2024-05-02 14:42:00 INFO NettyClientScan_thread_2 - createChannel: connect 
remote host[172.19.0.3:9876] success, 
AbstractBootstrap$PendingRegistrationPromise@61cd1078(success)
   2024-05-02 14:42:00 INFO NettyClientWorkerThread_4 - NETTY CLIENT PIPELINE: 
ACTIVE, 172.19.0.3:9876
   2024-05-02 14:42:00 INFO NettyServerCodecThread_5 - NETTY SERVER PIPELINE: 
channelRegistered 172.19.0.3:34814
   2024-05-02 14:42:00 INFO NettyServerCodecThread_5 - NETTY SERVER PIPELINE: 
channelActive, the channel[172.19.0.3:34814]
   2024-05-02 14:42:02 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:42:07 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:42:12 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:42:17 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:42:22 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:42:27 INFO NSScanScheduledThread - start scanNotActiveBroker
   2024-05-02 14:42:30 INFO NettyServerCodecThread_6 - NETTY SERVER PIPELINE: 
channelRegistered 172.19.0.2:40356
   2024-05-02 14:42:30 INFO NettyServerCodecThread_6 - NETTY SERVER PIPELINE: 
channelActive, the channel[172.19.0.2:40356]
   2024-05-02 14:42:30 WARN RemotingExecutorThread_15 - 
getAllTopicListFromNameserver /172.19.0.2:40356 enable true
   2024-05-02 14:42:32 INFO NSScanScheduledThread - start scanNotActiveBroker
   ```
   
   Error log from `broker remoting.log`:
   ```sh
   2024-05-02 14:56:12 INFO NettyClientWorkerThread_4 - closeChannel: the 
channel[localhost:9876] was removed from channel table
   2024-05-02 14:56:12 INFO NettyClientWorkerThread_4 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:12 INFO NettyClientWorkerThread_4 - eventCloseChannel: the 
channel[null] has been removed from the channel table before
   2024-05-02 14:56:12 ERROR BrokerControllerScheduledThread1 - 
getAndCreateNameserverChannel: create name server channel exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
[localhost:9876] failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.getAndCreateNameserverChannel(NettyRemotingClient.java:663)
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.getAndCreateChannel(NettyRemotingClient.java:618)
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:541)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:56:14 INFO NettyClientScan_thread_4 - createChannel: begin to 
connect remote host[localhost:9876] asynchronously
   2024-05-02 14:56:14 INFO NettyClientWorkerThread_1 - NETTY CLIENT PIPELINE: 
CONNECT  UNKNOWN => 127.0.0.1:9876
   2024-05-02 14:56:14 WARN NettyClientScan_thread_4 - createChannel: connect 
remote host[localhost:9876] failed, 
AbstractBootstrap$PendingRegistrationPromise@79da8429(failure: 
io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: 
localhost/127.0.0.1:9876)
   2024-05-02 14:56:14 INFO NettyClientWorkerThread_1 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:14 INFO NettyClientWorkerThread_1 - closeChannel: the 
channel[localhost:9876] was removed from channel table
   2024-05-02 14:56:14 INFO NettyClientWorkerThread_1 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:14 INFO NettyClientWorkerThread_1 - eventCloseChannel: the 
channel[null] has been removed from the channel table before
   2024-05-02 14:56:14 INFO NettyClientScan_thread_4 - createChannel: begin to 
connect remote host[localhost:9876] asynchronously
   2024-05-02 14:56:14 INFO NettyClientWorkerThread_4 - NETTY CLIENT PIPELINE: 
CONNECT  UNKNOWN => 127.0.0.1:9876
   2024-05-02 14:56:14 WARN NettyClientScan_thread_4 - createChannel: connect 
remote host[localhost:9876] failed, 
AbstractBootstrap$PendingRegistrationPromise@3946474c(failure: 
io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: 
localhost/127.0.0.1:9876)
   2024-05-02 14:56:14 INFO NettyClientWorkerThread_4 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:14 INFO NettyClientWorkerThread_4 - closeChannel: the 
channel[localhost:9876] was removed from channel table
   2024-05-02 14:56:14 INFO NettyClientWorkerThread_4 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:14 INFO NettyClientWorkerThread_4 - eventCloseChannel: the 
channel[null] has been removed from the channel table before
   2024-05-02 14:56:17 INFO BrokerControllerScheduledThread1 - new name server 
is chosen. OLD: localhost:9876 , NEW: localhost:9876. namesrvIndex = 1180
   2024-05-02 14:56:17 INFO BrokerControllerScheduledThread1 - createChannel: 
begin to connect remote host[localhost:9876] asynchronously
   2024-05-02 14:56:17 INFO NettyClientWorkerThread_2 - NETTY CLIENT PIPELINE: 
CONNECT  UNKNOWN => 127.0.0.1:9876
   2024-05-02 14:56:17 WARN BrokerControllerScheduledThread1 - createChannel: 
connect remote host[localhost:9876] failed, 
AbstractBootstrap$PendingRegistrationPromise@6f0143d9(failure: 
io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: 
localhost/127.0.0.1:9876)
   2024-05-02 14:56:17 INFO NettyClientWorkerThread_2 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:17 INFO NettyClientWorkerThread_2 - closeChannel: the 
channel[localhost:9876] was removed from channel table
   2024-05-02 14:56:17 INFO NettyClientWorkerThread_2 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:17 INFO NettyClientWorkerThread_2 - eventCloseChannel: the 
channel[null] has been removed from the channel table before
   2024-05-02 14:56:17 ERROR BrokerControllerScheduledThread1 - 
getAndCreateNameserverChannel: create name server channel exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
[localhost:9876] failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.getAndCreateNameserverChannel(NettyRemotingClient.java:663)
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.getAndCreateChannel(NettyRemotingClient.java:618)
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:541)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:56:17 INFO NettyClientScan_thread_1 - createChannel: begin to 
connect remote host[localhost:9876] asynchronously
   2024-05-02 14:56:17 INFO NettyClientWorkerThread_3 - NETTY CLIENT PIPELINE: 
CONNECT  UNKNOWN => 127.0.0.1:9876
   2024-05-02 14:56:17 WARN NettyClientScan_thread_1 - createChannel: connect 
remote host[localhost:9876] failed, 
AbstractBootstrap$PendingRegistrationPromise@268c468(failure: 
io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: 
localhost/127.0.0.1:9876)
   2024-05-02 14:56:17 INFO NettyClientWorkerThread_3 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:17 INFO NettyClientWorkerThread_3 - closeChannel: the 
channel[localhost:9876] was removed from channel table
   2024-05-02 14:56:17 INFO NettyClientWorkerThread_3 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:17 INFO NettyClientWorkerThread_3 - eventCloseChannel: the 
channel[null] has been removed from the channel table before
   2024-05-02 14:56:18 INFO NettyClientScan_thread_1 - createChannel: begin to 
connect remote host[localhost:9876] asynchronously
   2024-05-02 14:56:18 INFO NettyClientWorkerThread_1 - NETTY CLIENT PIPELINE: 
CONNECT  UNKNOWN => 127.0.0.1:9876
   2024-05-02 14:56:18 WARN NettyClientScan_thread_1 - createChannel: connect 
remote host[localhost:9876] failed, 
AbstractBootstrap$PendingRegistrationPromise@4b00330f(failure: 
io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: 
localhost/127.0.0.1:9876)
   2024-05-02 14:56:18 INFO NettyClientWorkerThread_1 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:18 INFO NettyClientWorkerThread_1 - closeChannel: the 
channel[localhost:9876] was removed from channel table
   2024-05-02 14:56:18 INFO NettyClientWorkerThread_1 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:18 INFO NettyClientWorkerThread_1 - eventCloseChannel: the 
channel[null] has been removed from the channel table before
   2024-05-02 14:56:21 INFO NettyClientScan_thread_2 - createChannel: begin to 
connect remote host[localhost:9876] asynchronously
   2024-05-02 14:56:21 INFO NettyClientWorkerThread_4 - NETTY CLIENT PIPELINE: 
CONNECT  UNKNOWN => 127.0.0.1:9876
   2024-05-02 14:56:21 WARN NettyClientScan_thread_2 - createChannel: connect 
remote host[localhost:9876] failed, 
AbstractBootstrap$PendingRegistrationPromise@710765e3(failure: 
io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: 
localhost/127.0.0.1:9876)
   2024-05-02 14:56:21 INFO NettyClientWorkerThread_4 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:21 INFO NettyClientWorkerThread_4 - closeChannel: the 
channel[localhost:9876] was removed from channel table
   2024-05-02 14:56:21 INFO NettyClientWorkerThread_4 - NETTY CLIENT PIPELINE: 
CLOSE 
   2024-05-02 14:56:21 INFO NettyClientWorkerThread_4 - eventCloseChannel: the 
channel[null] has been removed from the channel table before
   ```
   
   Error log from `broker.log`:
   ```sh
   2024-05-02 14:56:36 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:56:37 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:56:41 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:56:42 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:56:46 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:56:47 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:56:51 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:56:52 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:56:56 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:56:57 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:57:01 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:57:02 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:57:06 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:57:07 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:57:10 INFO BrokerControllerScheduledThread1 - Dispatch task 
fall behind commit log 0bytes
   2024-05-02 14:57:11 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:57:12 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:57:16 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:57:17 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:57:21 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:57:22 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:57:26 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:57:27 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:57:31 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:57:32 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:57:36 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:57:37 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:57:41 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:57:42 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:57:46 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:57:47 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   2024-05-02 14:57:51 INFO AclFileWatchService - The default acl dir 
/home/rocketmq/rocketmq-5.2.0/conf/acl is not exist
   2024-05-02 14:57:52 ERROR BrokerControllerScheduledThread1 - ScheduledTask 
refresh metadata exception
   org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to 
null failed
        at 
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:570)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.getBrokerClusterInfo(BrokerOuterAPI.java:1160)
        at 
org.apache.rocketmq.broker.out.BrokerOuterAPI.refreshMetadata(BrokerOuterAPI.java:1179)
        at 
org.apache.rocketmq.broker.BrokerController$21.run(BrokerController.java:1702)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
   ```
   
   my broker.conf info:
   ```sh
   # Broker的基本配置
   brokerClusterName = DefaultCluster  # Broker所属的集群名称
   brokerName = broker-a               # Broker的名称,标识不同的broker实例
   brokerId = 0                        # Broker的ID,0表示Master,非0表示Slave
   deleteWhen = 04                    # 文件删除时间点,格式为HH,此处设置为凌晨4点删除
   fileReservedTime = 48               # 文件保留时间,单位小时
   brokerRole = ASYNC_MASTER           # Broker角色,ASYNC_MASTER为异步复制Master
   flushDiskType = ASYNC_FLUSH         # 刷盘方式,ASYNC_FLUSH为异步刷盘
   
   # RocketMQ存储路径配置
   storePathRootDir = /home/rocketmq/store        # 存储根目录
   storePathCommitLog = /home/rocketmq/store/commitlog  # commitLog存储路径
   storeCheckpoint = /home/rocketmq/store/checkpoint    # 存储检查点文件的路径
   abortFile = /home/rocketmq/store/abort                # 异常终止文件路径
   
   # 消息队列文件的配置
   mapedFileSizeCommitLog = 1073741824    # commitLog文件大小,默认1GB
   mapedFileSizeConsumeQueue = 300000     # 消费队列文件的大小,默认300KB
   maxIndexNum = 5000000                  # 消息索引最大条目数
   
   # Topic和队列配置
   defaultTopicQueueNums=4      # 发送到默认Topic时,如果该Topic不存在,自动创建的队列数,默认为4
   autoCreateTopicEnable=true   # 是否允许Broker自动创建客户端试图发送但不存在的Topic,默认为true
   
   # 订阅组配置
   autoCreateSubscriptionGroup=true  # 是否允许Broker自动创建客户端试图消费但不存在的订阅组,默认为true
   
   maxMessageSize=10485760  # 设置消息最大为10MB
   nettyMaxFrameSize=10485760  # 设置Netty框架的最大帧大小也为10MB
   ```
   
   ### Steps to Reproduce
   
   It's simple, first build a `springboot` project.
   
   use it in maven:
   ```
           <dependency>
               <groupId>org.apache.rocketmq</groupId>
               <artifactId>rocketmq-client-java</artifactId>
               <version>5.0.6</version>
           </dependency>
   ```
   
   the ProducerSingleton class:
   ```java
   package com.example.springdemo.mq;
   
   
   import org.apache.rocketmq.client.apis.ClientConfiguration;
   import org.apache.rocketmq.client.apis.ClientException;
   import org.apache.rocketmq.client.apis.ClientServiceProvider;
   import org.apache.rocketmq.client.apis.SessionCredentialsProvider;
   import org.apache.rocketmq.client.apis.StaticSessionCredentialsProvider;
   import org.apache.rocketmq.client.apis.producer.Producer;
   import org.apache.rocketmq.client.apis.producer.ProducerBuilder;
   import org.apache.rocketmq.client.apis.producer.TransactionChecker;
   
   /**
    * Each client will establish an independent connection to the server node 
within a process.
    *
    * <p>In most cases, the singleton mode can meet the requirements of higher 
concurrency.
    * If multiple connections are desired, consider increasing the number of 
clients appropriately.
    */
   public class ProducerSingleton {
       private static volatile Producer PRODUCER;
       private static volatile Producer TRANSACTIONAL_PRODUCER;
       private static final String ACCESS_KEY = "yourAccessKey";
       private static final String SECRET_KEY = "yourSecretKey";
       private static final String ENDPOINTS = "192.168.1.162:9876";
   
       private ProducerSingleton() {
       }
   
       private static Producer buildProducer(TransactionChecker checker, 
String... topics) throws ClientException {
           final ClientServiceProvider provider = 
ClientServiceProvider.loadService();
           // Credential provider is optional for client configuration.
           // This parameter is necessary only when the server ACL is enabled. 
Otherwise,
           // it does not need to be set by default.
           SessionCredentialsProvider sessionCredentialsProvider =
                   new StaticSessionCredentialsProvider(ACCESS_KEY, SECRET_KEY);
           ClientConfiguration clientConfiguration = 
ClientConfiguration.newBuilder()
                   .setEndpoints(ENDPOINTS)
                   // On some Windows platforms, you may encounter SSL 
compatibility issues. Try turning off the SSL option in
                   // client configuration to solve the problem please if SSL 
is not essential.
                   .enableSsl(false)
                   .setCredentialProvider(sessionCredentialsProvider)
                   .build();
           final ProducerBuilder builder = provider.newProducerBuilder()
                   .setClientConfiguration(clientConfiguration)
                   // Set the topic name(s), which is optional but recommended. 
It makes producer could prefetch
                   // the topic route before message publishing.
                   .setTopics(topics);
           if (checker != null) {
               // Set the transaction checker.
               builder.setTransactionChecker(checker);
           }
           return builder.build();
       }
   
       public static Producer getInstance(String... topics) throws 
ClientException {
           if (null == PRODUCER) {
               synchronized (ProducerSingleton.class) {
                   if (null == PRODUCER) {
                       PRODUCER = buildProducer(null, topics);
                   }
               }
           }
           return PRODUCER;
       }
   
       public static Producer getTransactionalInstance(TransactionChecker 
checker,
                                                       String... topics) throws 
ClientException {
           if (null == TRANSACTIONAL_PRODUCER) {
               synchronized (ProducerSingleton.class) {
                   if (null == TRANSACTIONAL_PRODUCER) {
                       TRANSACTIONAL_PRODUCER = buildProducer(checker, topics);
                   }
               }
           }
           return TRANSACTIONAL_PRODUCER;
       }
   }
   ```
   
   the MessageProducer class:
   ```java
   package com.example.springdemo.mq;
   
   import java.nio.charset.StandardCharsets;
   import org.apache.rocketmq.client.apis.ClientException;
   import org.apache.rocketmq.client.apis.ClientServiceProvider;
   import org.apache.rocketmq.client.apis.message.Message;
   import org.apache.rocketmq.client.apis.producer.Producer;
   import org.apache.rocketmq.client.apis.producer.SendReceipt;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   /**
    * @author muyouzhi
    */
   public class MessageProducer {
       private static final Logger log = 
LoggerFactory.getLogger(MessageProducer.class);
   
       private MessageProducer() {
       }
   
       public static void main(String[] args) throws ClientException {
           final ClientServiceProvider provider = 
ClientServiceProvider.loadService();
   
           String topic = "TopicTest";
           final Producer producer = ProducerSingleton.getInstance(topic);
           // Define your message body.
           byte[] body = "This is a normal message for Apache 
RocketMQ".getBytes(StandardCharsets.UTF_8);
           String tag = "yourMessageTagA";
           final Message message = provider.newMessageBuilder()
                   // Set topic for the current message.
                   .setTopic(topic)
                   // Message secondary classifier of message besides topic.
                   .setTag(tag)
                   // Key(s) of the message, another way to mark message 
besides message id.
                   .setKeys("yourMessageKey-1c151062f96e")
                   .setBody(body)
                   .build();
           try {
               final SendReceipt sendReceipt = producer.send(message);
               log.info("Send message successfully, messageId={}", 
sendReceipt.getMessageId());
           } catch (Throwable t) {
               log.error("Failed to send message", t);
           }
       }
   }
   ```
   
   then run `main()` in `MessageProducer`
   
   You will see the error after
   
   ### What Did You Expect to See?
   
   a success message
   
   ### What Did You See Instead?
   
   /Library/Java/JavaVirtualMachines/openjdk-17.jdk/Contents/Home/bin/java 
-javaagent:/Users/muyouzhi/Applications/IntelliJ IDEA 
Ultimate.app/Contents/lib/idea_rt.jar=58565:/Users/muyouzhi/Applications/IntelliJ
 IDEA Ultimate.app/Contents/bin -Dfile.encoding=UTF-8 -classpath 
/Users/muyouzhi/Code/demo/spring/spring-demo/target/classes:/Users/muyouzhi/.m2/repository/org/springframework/boot/spring-boot-starter-web/2.6.13/spring-boot-starter-web-2.6.13.jar:/Users/muyouzhi/.m2/repository/org/springframework/boot/spring-boot-starter/2.6.13/spring-boot-starter-2.6.13.jar:/Users/muyouzhi/.m2/repository/org/springframework/boot/spring-boot/2.6.13/spring-boot-2.6.13.jar:/Users/muyouzhi/.m2/repository/org/springframework/boot/spring-boot-autoconfigure/2.6.13/spring-boot-autoconfigure-2.6.13.jar:/Users/muyouzhi/.m2/repository/org/springframework/boot/spring-boot-starter-logging/2.6.13/spring-boot-starter-logging-2.6.13.jar:/Users/muyouzhi/.m2/repository/ch/qos/logback/logback-classic/1.2.11/logb
 
ack-classic-1.2.11.jar:/Users/muyouzhi/.m2/repository/ch/qos/logback/logback-core/1.2.11/logback-core-1.2.11.jar:/Users/muyouzhi/.m2/repository/org/apache/logging/log4j/log4j-to-slf4j/2.17.2/log4j-to-slf4j-2.17.2.jar:/Users/muyouzhi/.m2/repository/org/apache/logging/log4j/log4j-api/2.17.2/log4j-api-2.17.2.jar:/Users/muyouzhi/.m2/repository/org/slf4j/jul-to-slf4j/1.7.36/jul-to-slf4j-1.7.36.jar:/Users/muyouzhi/.m2/repository/jakarta/annotation/jakarta.annotation-api/1.3.5/jakarta.annotation-api-1.3.5.jar:/Users/muyouzhi/.m2/repository/org/yaml/snakeyaml/1.29/snakeyaml-1.29.jar:/Users/muyouzhi/.m2/repository/org/springframework/boot/spring-boot-starter-json/2.6.13/spring-boot-starter-json-2.6.13.jar:/Users/muyouzhi/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.13.4.2/jackson-databind-2.13.4.2.jar:/Users/muyouzhi/.m2/repository/com/fasterxml/jackson/core/jackson-annotations/2.13.4/jackson-annotations-2.13.4.jar:/Users/muyouzhi/.m2/repository/com/fasterxml/jackson/core/jac
 
kson-core/2.13.4/jackson-core-2.13.4.jar:/Users/muyouzhi/.m2/repository/com/fasterxml/jackson/datatype/jackson-datatype-jdk8/2.13.4/jackson-datatype-jdk8-2.13.4.jar:/Users/muyouzhi/.m2/repository/com/fasterxml/jackson/datatype/jackson-datatype-jsr310/2.13.4/jackson-datatype-jsr310-2.13.4.jar:/Users/muyouzhi/.m2/repository/com/fasterxml/jackson/module/jackson-module-parameter-names/2.13.4/jackson-module-parameter-names-2.13.4.jar:/Users/muyouzhi/.m2/repository/org/springframework/boot/spring-boot-starter-tomcat/2.6.13/spring-boot-starter-tomcat-2.6.13.jar:/Users/muyouzhi/.m2/repository/org/apache/tomcat/embed/tomcat-embed-core/9.0.68/tomcat-embed-core-9.0.68.jar:/Users/muyouzhi/.m2/repository/org/apache/tomcat/embed/tomcat-embed-el/9.0.68/tomcat-embed-el-9.0.68.jar:/Users/muyouzhi/.m2/repository/org/apache/tomcat/embed/tomcat-embed-websocket/9.0.68/tomcat-embed-websocket-9.0.68.jar:/Users/muyouzhi/.m2/repository/org/springframework/spring-web/5.3.23/spring-web-5.3.23.jar:/Users/muyou
 
zhi/.m2/repository/org/springframework/spring-beans/5.3.23/spring-beans-5.3.23.jar:/Users/muyouzhi/.m2/repository/org/springframework/spring-webmvc/5.3.23/spring-webmvc-5.3.23.jar:/Users/muyouzhi/.m2/repository/org/springframework/spring-aop/5.3.23/spring-aop-5.3.23.jar:/Users/muyouzhi/.m2/repository/org/springframework/spring-context/5.3.23/spring-context-5.3.23.jar:/Users/muyouzhi/.m2/repository/org/springframework/spring-expression/5.3.23/spring-expression-5.3.23.jar:/Users/muyouzhi/.m2/repository/org/apache/rocketmq/rocketmq-client-java/5.0.6/rocketmq-client-java-5.0.6.jar:/Users/muyouzhi/.m2/repository/org/apache/tomcat/annotations-api/6.0.53/annotations-api-6.0.53.jar:/Users/muyouzhi/.m2/repository/org/projectlombok/lombok/1.18.24/lombok-1.18.24.jar:/Users/muyouzhi/.m2/repository/org/slf4j/slf4j-api/1.7.36/slf4j-api-1.7.36.jar:/Users/muyouzhi/.m2/repository/org/springframework/spring-core/5.3.23/spring-core-5.3.23.jar:/Users/muyouzhi/.m2/repository/org/springframework/spring-j
 cl/5.3.23/spring-jcl-5.3.23.jar com.example.springdemo.mq.MessageProducer
   Exception in thread "main" java.lang.IllegalStateException: Expected the 
service ProducerImpl-0 [FAILED] to be RUNNING, but the service has FAILED
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.AbstractService.checkCurrentState(AbstractService.java:381)
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.AbstractService.awaitRunning(AbstractService.java:305)
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.AbstractIdleService.awaitRunning(AbstractIdleService.java:165)
        at 
org.apache.rocketmq.client.java.impl.producer.ProducerBuilderImpl.build(ProducerBuilderImpl.java:93)
        at 
com.example.springdemo.mq.ProducerSingleton.buildProducer(ProducerSingleton.java:52)
        at 
com.example.springdemo.mq.ProducerSingleton.getInstance(ProducerSingleton.java:59)
        at 
com.example.springdemo.mq.MessageProducer.main(MessageProducer.java:25)
   Caused by: java.util.concurrent.ExecutionException: 
org.apache.rocketmq.shaded.io.grpc.StatusRuntimeException: UNAVAILABLE: Network 
closed for unknown reason
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.AbstractFuture.getDoneValue(AbstractFuture.java:588)
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:567)
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.FluentFuture$TrustedFuture.get(FluentFuture.java:91)
        at 
org.apache.rocketmq.client.java.impl.ClientImpl.startUp(ClientImpl.java:188)
        at 
org.apache.rocketmq.client.java.impl.producer.ProducerImpl.startUp(ProducerImpl.java:114)
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.AbstractIdleService$DelegateService$1.run(AbstractIdleService.java:62)
        at 
org.apache.rocketmq.shaded.com.google.common.util.concurrent.Callables.lambda$threadRenaming$3(Callables.java:103)
        at java.base/java.lang.Thread.run(Thread.java:840)
   Caused by: org.apache.rocketmq.shaded.io.grpc.StatusRuntimeException: 
UNAVAILABLE: Network closed for unknown reason
        at 
org.apache.rocketmq.shaded.io.grpc.Status.asRuntimeException(Status.java:539)
        at 
org.apache.rocketmq.shaded.io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:544)
        at 
org.apache.rocketmq.shaded.io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
        at 
org.apache.rocketmq.shaded.io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
        at 
org.apache.rocketmq.shaded.io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
        at 
org.apache.rocketmq.shaded.io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:563)
        at 
org.apache.rocketmq.shaded.io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:70)
        at 
org.apache.rocketmq.shaded.io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:744)
        at 
org.apache.rocketmq.shaded.io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:723)
        at 
org.apache.rocketmq.shaded.io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
        at 
org.apache.rocketmq.shaded.io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:133)
        at 
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
        at 
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
        ... 1 more
   
   进程已结束,退出代码为 1
   
   
   ### Additional Context
   
    Hey, is the `Grpc` API of `RocketMQ` available? Why do I have this problem 
no matter if it is `golang rocketmq sdk` or `java rocketmq sdk` or `nodejs 
rocketmq sdk`? Why? ? ?
   
   I don't think it's a server-side problem. I tried using docker to deploy, 
compile the source code and run it, and use the compiled binary file to run, 
but this error will appear.
   
   The strange thing is that `io.netty.handler.codec.TooLongFrameException: 
Adjusted frame length exceeds 16777216: 1347569956 - discarded` This error 
should be impossible. There is no such a large message. I just transmitted a 
35-byte message. Or is it a Netty serialization problem? I don't understand, 
why does it happen?
   
   And why is the community of this project so inactive? It seems that no one 
will answer my questions.


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