fix issue:204, branch develop

[joeyzhouy]

fix issue:#204, branch develop

[AlexStocks]

LGTM

[codecov-io]

Codecov Report

Merging #206 into develop will increase coverage by 1.06%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop     #206      +/-   ##
===========================================
+ Coverage    66.76%   67.82%   +1.06%     
===========================================
  Files           94       94              
  Lines         5847     5847              
===========================================
+ Hits          3904     3966      +62     
+ Misses        1544     1478      -66     
- Partials       399      403       +4

Impacted Files	Coverage Δ
protocol/dubbo/client.go	70.94% <0%> (ø)	⬆️
protocol/dubbo/server.go	66.25% <0%> (ø)	⬆️
protocol/jsonrpc/server.go	59.79% <0%> (-1.51%)	⬇️
registry/etcdv3/registry.go	56.25% <0%> (-1.14%)	⬇️
protocol/dubbo/readwriter.go	70.37% <0%> (+2.46%)	⬆️
protocol/dubbo/codec.go	82.35% <0%> (+5.88%)	⬆️
protocol/dubbo/listener.go	64.02% <0%> (+14.02%)	⬆️
protocol/dubbo/pool.go	73.6% <0%> (+15.73%)	⬆️
cluster/cluster_impl/base_cluster_invoker.go	71.69% <0%> (+16.98%)	⬆️

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