Issue 1:
I have searched the issues of this repository and believe that this is not a duplicate.

I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

Dubbo version: 2.7.4

Operating System version: Mac

Java version: 1.8

Steps to reproduce this issue

import the source code of dubbo.

at root of the dubbo, execute mvn install

run zookeeper at localhost:2181

cd to dubbo-demo/dubbo-demo-api/dubbo-demo-api-provide/src/...... run main()

has error No such extension org.apache.dubbo.configcenter.DynamicConfigurationFactory by name zookeeper

i want to run this demo at local.

Issue 2:
I have searched the issues of this repository and believe that this is not a duplicate.

I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

Dubbo version: 2.5.4

Operating System version: linux

Java version: 1.8

Steps to reproduce this issue

many request once time

6000, group=smart}]], channel: /172.16.31.191:44814 -> /172.16.21.41:20835

at com.alibaba.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:101)

at com.alibaba.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:227)

at com.alibaba.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker.invoke(MockClusterInvoker.java:72)

at com.alibaba.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:52)

at com.alibaba.dubbo.common.bytecode.proxy1.getUserBySession(proxy1.java)

at

Caused by: com.alibaba.dubbo.remoting.TimeoutException: Sending request timeout in client-side by scan timer. start time: 2019-01-26 00:02:04.295, end time: 2019-01-26 00:02:10.301, elapsed: 6006 ms, timeout: 6000 ms, request: Request [id=258487922, version=2.0.0, twoway=true, event=false, broken=false, data=RpcInvocation

at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture.returnFromResponse(DefaultFuture.java:188)

at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture.get(DefaultFuture.java:110)

at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture.get(DefaultFuture.java:84)

at com.alibaba.dubbo.rpc.protocol.dubbo.DubboInvoker.doInvoke(DubboInvoker.java:96)

at com.alibaba.dubbo.rpc.protocol.AbstractInvoker.invoke(AbstractInvoker.java:144)

at com.tuya.basic.dubbo.ext.filter.ServiceDegradationFilter.invoke(ServiceDegradationFilter.java:44)

at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)

at com.alibaba.csp.sentinel.adapter.dubbo.DubboAppContextFilter.invoke(DubboAppContextFilter.java:41)

at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)

at com.alibaba.csp.sentinel.adapter.dubbo.SentinelDubboConsumerFilter.invoke(SentinelDubboConsumerFilter.java:60)

at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)

at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:75)

at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)

at com.alibaba.dubbo.rpc.protocol.dubbo.filter.FutureFilter.invoke(FutureFilter.java:53)

at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)

at com.alibaba.dubbo.rpc.filter.ConsumerContextFilter.invoke(ConsumerContextFilter.java:48)

at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)

at com.alibaba.dubbo.rpc.listener.ListenerInvokerWrapper.invoke(ListenerInvokerWrapper.java:74)

at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:53)

at com.alibaba.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:77)

... 39 common frames omitted

什么原因会导致TimeoutException: Sending request timeout in client-side by scan timer异常