sunby edited a comment on issue #11768:
URL: https://github.com/apache/pulsar/issues/11768#issuecomment-905243645


   @lhotari I reproduce it with pulsar 2.8.0. 
   ```
   06:55:34.455 [client-scheduler-OrderedScheduler-2-0] ERROR 
org.apache.bookkeeper.clients.impl.internal.RootRangeClientImplWithRetries - 
Reason for the failure {}
   io.grpc.StatusRuntimeException: UNAVAILABLE: io exception
        at io.grpc.Status.asRuntimeException(Status.java:533) 
~[io.grpc-grpc-api-1.33.0.jar:1.33.0]
        at 
io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:533) 
~[io.grpc-grpc-stub-1.33.0.jar:1.33.0]
        at 
io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:616) 
~[io.grpc-grpc-core-1.33.0.jar:1.33.0]
        at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:69) 
~[io.grpc-grpc-core-1.33.0.jar:1.33.0]
        at 
io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:802)
 ~[io.grpc-grpc-core-1.33.0.jar:1.33.0]
        at 
io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:781)
 ~[io.grpc-grpc-core-1.33.0.jar:1.33.0]
        at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37) 
~[io.grpc-grpc-core-1.33.0.jar:1.33.0]
        at 
io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123) 
~[io.grpc-grpc-core-1.33.0.jar:1.33.0]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) 
~[?:?]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) 
~[?:?]
        at java.lang.Thread.run(Thread.java:829) [?:?]
   Caused by: 
io.grpc.netty.shaded.io.netty.channel.AbstractChannel$AnnotatedConnectException:
 finishConnect(..) failed: Connection refused: /172.27.0.2:4181
   Caused by: java.net.ConnectException: finishConnect(..) failed: Connection 
refused
        at 
io.grpc.netty.shaded.io.netty.channel.unix.Errors.throwConnectException(Errors.java:124)
 ~[io.grpc-grpc-netty-shaded-1.33.0.jar:1.33.0]
        at 
io.grpc.netty.shaded.io.netty.channel.unix.Socket.finishConnect(Socket.java:243)
 ~[io.grpc-grpc-netty-shaded-1.33.0.jar:1.33.0]
        at 
io.grpc.netty.shaded.io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.doFinishConnect(AbstractEpollChannel.java:672)
 ~[io.grpc-grpc-netty-shaded-1.33.0.jar:1.33.0]
        at 
io.grpc.netty.shaded.io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.finishConnect(AbstractEpollChannel.java:649)
 ~[io.grpc-grpc-netty-shaded-1.33.0.jar:1.33.0]
        at 
io.grpc.netty.shaded.io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.epollOutReady(AbstractEpollChannel.java:529)
 ~[io.grpc-grpc-netty-shaded-1.33.0.jar:1.33.0]
        at 
io.grpc.netty.shaded.io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:465)
 ~[io.grpc-grpc-netty-shaded-1.33.0.jar:1.33.0]
        at 
io.grpc.netty.shaded.io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378)
 ~[io.grpc-grpc-netty-shaded-1.33.0.jar:1.33.0]
        at 
io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
 ~[io.grpc-grpc-netty-shaded-1.33.0.jar:1.33.0]
        at 
io.grpc.netty.shaded.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
 ~[io.grpc-grpc-netty-shaded-1.33.0.jar:1.33.0]
        at 
io.grpc.netty.shaded.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
 ~[io.grpc-grpc-netty-shaded-1.33.0.jar:1.33.0]
        ... 1 more
   ```
   
   Here is the log file
   
[pulsar-08-25(1).log](https://github.com/apache/pulsar/files/7044481/pulsar-08-25.1.log)
   


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