avoid resize

[fanghuabing]

The threshold of an HashMap is the product of current capacity and load factor.

Threshold = (Current Capacity) * (Load Factor)

For example, if the HashMap is created with initial capacity of 16 and load factor of 0.75f, then threshold will be,

Threshold = 16 * 0.75 = 12

That means, the capacity of the HashMap is increased from 16 to 32 after the 12th element (key-value pair) is added into the HashMap.

[Moriadry-zz]

LGTM

Thank you for your contribution! :)

[codecov-io]

Codecov Report

Merging #5009 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #5009      +/-   ##
============================================
+ Coverage     63.89%   63.93%   +0.04%     
- Complexity      450      451       +1     
============================================
  Files           769      769              
  Lines         33176    33176              
  Branches       5216     5230      +14     
============================================
+ Hits          21197    21212      +15     
+ Misses         9547     9537      -10     
+ Partials       2432     2427       -5

Impacted Files	Coverage Δ	Complexity Δ
...java/org/apache/dubbo/common/utils/ClassUtils.java	71.13% <100%> (ø)	0 <0> (ø)	⬇️
.../apache/dubbo/qos/protocol/QosProtocolWrapper.java	70.73% <0%> (-12.2%)	0% <0%> (ø)
.../dubbo/remoting/transport/netty4/NettyChannel.java	60.22% <0%> (-3.41%)	0% <0%> (ø)
...che/dubbo/common/compiler/support/JdkCompiler.java	64.54% <0%> (ø)	0% <0%> (ø)	⬇️
...org/apache/dubbo/registry/redis/RedisRegistry.java	48.15% <0%> (+0.28%)	31% <0%> (ø)	⬇️
.../java/org/apache/dubbo/config/ReferenceConfig.java	60.94% <0%> (+0.36%)	0% <0%> (ø)	⬇️
...org/apache/dubbo/config/context/ConfigManager.java	66.66% <0%> (+0.79%)	0% <0%> (ø)	⬇️
...dubbo/remoting/exchange/support/DefaultFuture.java	93.75% <0%> (+1.04%)	0% <0%> (ø)	⬇️
...ache/dubbo/common/compiler/support/ClassUtils.java	50.26% <0%> (+1.04%)	0% <0%> (ø)	⬇️
...e/dubbo/remoting/transport/netty/NettyChannel.java	60.22% <0%> (+1.13%)	21% <0%> (+1%)	⬆️
... and 8 more

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