[ISSUE-#7297] When first call getServiceAppMapping, reduce once network transport.

[horizonzy]

What is the purpose of the change

For-#7297.

[codecov-io]

Codecov Report

Merging #7298 (83e6a2f) into master (eef6b45) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #7298      +/-   ##
============================================
- Coverage     59.06%   59.03%   -0.04%     
+ Complexity      462      461       -1     
============================================
  Files          1044     1044              
  Lines         42480    42480              
  Branches       6229     6229              
============================================
- Hits          25090    25077      -13     
- Misses        14591    14599       +8     
- Partials       2799     2804       +5     

Impacted Files	Coverage Δ	Complexity Δ
...adata/store/zookeeper/ZookeeperMetadataReport.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...bo/config/event/listener/LoggingEventListener.java	37.50% <0.00%> (-25.00%)	0.00% <0.00%> (ø%)
...e/dubbo/remoting/transport/netty/NettyChannel.java	55.68% <0.00%> (-4.55%)	20.00% <0.00%> (-1.00%)
...ava/org/apache/dubbo/config/DubboShutdownHook.java	70.21% <0.00%> (-4.26%)	0.00% <0.00%> (ø%)
...he/dubbo/rpc/protocol/hessian/HessianProtocol.java	67.46% <0.00%> (-2.41%)	9.00% <0.00%> (ø%)
...org/apache/dubbo/registry/redis/RedisRegistry.java	48.81% <0.00%> (-1.19%)	27.00% <0.00%> (-1.00%)
...he/dubbo/registry/multicast/MulticastRegistry.java	67.12% <0.00%> (-0.93%)	0.00% <0.00%> (ø%)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	60.00% <0.00%> (-0.59%)	31.00% <0.00%> (ø%)
...rg/apache/dubbo/common/timer/HashedWheelTimer.java	79.38% <0.00%> (-0.35%)	0.00% <0.00%> (ø%)
...apache/dubbo/common/extension/ExtensionLoader.java	78.07% <0.00%> (-0.23%)	0.00% <0.00%> (ø%)
... and 2 more

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[xiaoheng1]

LGTM

[AlbumenJ]

LGTM.