performance optimization of high concurrency

[atellwu]

In the case of high concurrency, many errors are reported, mainly performance related

「invokewithcallback」 is for: check connection failed for address: origin URL [x.x.x.x:43314], unique key [x.x.x.x:43314], maybe write overflow!
「exception」 is for: represents timeout
「retrytimes」 is for: it means to retry 10 times or fail, and finally give up

How to solve

• Use multiple connections between sessionServer and dataServer
• Resolve the low efficiency of processing in SessionServer
  e.g. trace com.alipay.sofa.registry.server.session.remoting.handler.DataChangeRequestHandler reply -n 100 #cost>2000