Binding attachment before a clusterInvoker invoke.

[carryxyh]

• Binding attachments into invocation so that a rpc invoke have a same invocation
• Fix a bug that the ForkingClusterInvoker don't clear attachment when a rpc invoke is over.

[codecov-io]

Codecov Report

Merging #2125 into master will decrease coverage by 0.08%.
The diff coverage is 79.41%.

@@             Coverage Diff             @@
##             master   #2125      +/-   ##
===========================================
- Coverage     54.19%   54.1%   -0.09%     
+ Complexity     5085    5081       -4     
===========================================
  Files           559     559              
  Lines         24922   24926       +4     
  Branches       4442    4443       +1     
===========================================
- Hits          13506   13487      -19     
- Misses         9380    9402      +22     
- Partials       2036    2037       +1

Impacted Files	Coverage Δ	Complexity Δ
...org/apache/dubbo/rpc/protocol/AbstractInvoker.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...bo/rpc/cluster/support/AbstractClusterInvoker.java	70.47% <66.66%> (-0.12%)	42 <0> (+1)
...bbo/rpc/cluster/support/ForkingClusterInvoker.java	85.71% <83.33%> (+0.42%)	7 <6> (ø)	⬇️
...che/dubbo/remoting/transport/mina/MinaChannel.java	42.25% <0%> (-11.27%)	15% <0%> (-1%)
...e/dubbo/remoting/transport/netty/NettyChannel.java	57.5% <0%> (-8.75%)	19% <0%> (-2%)
...he/dubbo/remoting/transport/netty/NettyClient.java	72.88% <0%> (-8.48%)	12% <0%> (-1%)
...dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java	77.2% <0%> (-1.48%)	29% <0%> (ø)
...apache/dubbo/rpc/protocol/dubbo/DubboProtocol.java	58.33% <0%> (-0.84%)	30% <0%> (-1%)
...org/apache/dubbo/rpc/filter/ActiveLimitFilter.java	88.88% <0%> (+5.55%)	7% <0%> (+1%)	⬆️

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[kimmking]

awesome