dubbo zookeeper registry too slow

[qixiaobo]

ref to #4828
I just add concurrentHashSet to avoid checking persistent node exist

[qixiaobo]

@tswstarplanet You are right, I find the metaDataReport delete the persist node

[codecov-io]

Codecov Report

Merging #4880 into master will decrease coverage by 0.03%.
The diff coverage is 57.14%.

@@             Coverage Diff              @@
##             master    #4880      +/-   ##
============================================
- Coverage     63.97%   63.93%   -0.04%     
- Complexity      452      453       +1     
============================================
  Files           769      769              
  Lines         33157    33168      +11     
  Branches       5228     5232       +4     
============================================
- Hits          21211    21206       -5     
- Misses         9525     9545      +20     
+ Partials       2421     2417       -4

Impacted Files	Coverage Δ	Complexity Δ
...ing/zookeeper/support/AbstractZookeeperClient.java	67.04% <57.14%> (-3.33%)	0 <0> (ø)
.../apache/dubbo/qos/protocol/QosProtocolWrapper.java	65.85% <0%> (-17.08%)	0% <0%> (ø)
...ache/dubbo/remoting/transport/AbstractChannel.java	75% <0%> (-12.5%)	0% <0%> (ø)
...o/rpc/cluster/loadbalance/AbstractLoadBalance.java	42.85% <0%> (-10.09%)	0% <0%> (ø)
...bbo/registry/support/ProviderConsumerRegTable.java	80.48% <0%> (-4.88%)	0% <0%> (ø)
.../dubbo/monitor/support/AbstractMonitorFactory.java	78.37% <0%> (-2.71%)	0% <0%> (ø)
.../rpc/protocol/dubbo/LazyConnectExchangeClient.java	56.47% <0%> (-2.36%)	0% <0%> (ø)
.../apache/dubbo/remoting/transport/AbstractPeer.java	60.86% <0%> (-2.18%)	0% <0%> (ø)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	61.87% <0%> (-0.63%)	29% <0%> (ø)
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	90.65% <0%> (+0.93%)	17% <0%> (+1%)	⬆️
... and 4 more

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[beiwei30]

the change looks good except for explicitly using guava, pls. change it. @qixiaobo

[beiwei30]

LGTM