fix the bug can't subscribe the interface #5085

[CodingSinger]

fix the bug #5085

[codecov-io]

Codecov Report

Merging #5086 into master will increase coverage by 0.02%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master    #5086      +/-   ##
============================================
+ Coverage        64%   64.02%   +0.02%     
- Complexity      451      452       +1     
============================================
  Files           769      769              
  Lines         33251    33293      +42     
  Branches       5247     5251       +4     
============================================
+ Hits          21282    21316      +34     
- Misses         9541     9543       +2     
- Partials       2428     2434       +6

Impacted Files	Coverage Δ	Complexity Δ
...he/dubbo/registry/zookeeper/ZookeeperRegistry.java	67.36% <66.66%> (+0.69%)	0 <0> (ø)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0%> (-4.35%)	0% <0%> (ø)
...c/main/java/org/apache/dubbo/rpc/RpcException.java	80% <0%> (-3.34%)	0% <0%> (ø)
...he/dubbo/registry/multicast/MulticastRegistry.java	67.87% <0%> (-1.81%)	0% <0%> (ø)
.../dubbo/remoting/transport/netty4/NettyChannel.java	63.63% <0%> (-1.14%)	0% <0%> (ø)
...rg/apache/dubbo/common/timer/HashedWheelTimer.java	62.41% <0%> (-0.35%)	0% <0%> (ø)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	62.5% <0%> (+0.62%)	29% <0%> (ø)	⬇️
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	90.65% <0%> (+0.93%)	17% <0%> (+1%)	⬆️
...ing/zookeeper/support/AbstractZookeeperClient.java	69.66% <0%> (+3.37%)	0% <0%> (ø)	⬇️
... and 1 more

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[CLAassistant]

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[Patrick0308]

这么做的话，zookeeper上短时间内删除和增加相同的节点会导致所有机器重新subcribe这些节点，会不会网络波动有点大？

[CodingSinger]

这么做的话，zookeeper上短时间内删除和增加相同的节点会导致所有机器重新subcribe这些节点，会不会网络波动有点大？

谢谢反馈，但是没明白你的意思，这个改动只是新增了在节点被删除后对内部已订阅节点的缓存的清理，我觉得这是符合逻辑的，至于你说的上下线导致的网络流量过大这个问题，是zookeeper作为注册中心一直有的问题，和pr应该没啥直接联系。

[xiantang]

Refactor: using iterators to remove child is better ?

[AlbumenJ]

@CodingSinger Hi, thanks for your contributions.

Please merge the latest master branch to resolve confilcting files.

[AlbumenJ]

Close for long time no response.

Please feel free to reopen if you have any question.

If you think these changes still useful in the latest master branch, please submit a new pull request.