tianshuang commented on issue #8513:
URL: https://github.com/apache/dubbo/issues/8513#issuecomment-917768818
2.7.5 昨天也遇到该问题，持续一分钟左右自动恢复，排除了 FullGC, 暂时没找到原因
```
Caused by: org.apache.dubbo.remoting.TimeoutException: Waiting server-side
response timeout by scan timer. start time: 2021-09-12 17:07:02.423, end time:
2021-09-12 17:07:22.432, client elapsed: 19217 ms, server elapsed: 791 ms,
timeout: 20000 ms, request: Request [id=9841521, version=2.0.2, twoway=true,
event=false, broken=false, data=null], channel: /172.31.168.27:43984 ->
/172.31.135.36:20891
at
org.apache.dubbo.remoting.exchange.support.DefaultFuture.doReceived(DefaultFuture.java:210)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.remoting.exchange.support.DefaultFuture.received(DefaultFuture.java:175)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.remoting.exchange.support.DefaultFuture$TimeoutCheckTask.notifyTimeout(DefaultFuture.java:297)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.remoting.exchange.support.DefaultFuture$TimeoutCheckTask.lambda$run$0(DefaultFuture.java:284)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.common.threadpool.ThreadlessExecutor.waitAndDrain(ThreadlessExecutor.java:77)
~[dubbo-2.7.5.jar:2.7.5]
at org.apache.dubbo.rpc.AsyncRpcResult.get(AsyncRpcResult.java:175)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.rpc.protocol.AsyncToSyncInvoker.invoke(AsyncToSyncInvoker.java:61)
~[dubbo-2.7.5.jar:2.7.5]
at
com.yunti.dubbo.filter.DubboConsumerFilter.invoke(DubboConsumerFilter.java:61)
~[yunti-dubbo-tool-1.0-SNAPSHOT.jar:?]
at
org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:81)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:89)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:81)
~[dubbo-2.7.5.jar:2.7.5]
at
com.alibaba.csp.sentinel.adapter.dubbo.DubboAppContextFilter.invoke(DubboAppContextFilter.java:43)
~[sentinel-apache-dubbo-adapter-1.8.0.jar:?]
at
org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:81)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.rpc.protocol.dubbo.filter.FutureFilter.invoke(FutureFilter.java:49)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:81)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.rpc.filter.ConsumerContextFilter.invoke(ConsumerContextFilter.java:55)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:81)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.rpc.listener.ListenerInvokerWrapper.invoke(ListenerInvokerWrapper.java:78)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:56)
~[dubbo-2.7.5.jar:2.7.5]
at
org.apache.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:82)
~[dubbo-2.7.5.jar:2.7.5]
... 51 more
```
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