owen200008 opened a new issue #8895:
URL: https://github.com/apache/dubbo/issues/8895
### Environment
* Dubbo version: 2.7.14
* Operating System version: win,centos
* Java version: jdk8 & jdk11
### Steps to reproduce this issue
for 1, n do
1. instance = ReferenceConfig.get();
2. call instance.func() success();
3. ReferenceConfig.destroy()
end
the exchangeclient no close.
the connects = n * set connects
### Expected Result
ReferenceConfig set connects = 5
and the connect session size = 5 * n
the exchange client resource no gc.
### Actual Result
in my case, the old-gen use too much and full gc call frequently
now i find two problem
1. transfer layer, close exception
have two same service(hotload ReferenceConfig), notify each other then
2. Registration Center notify and close session will connect again, and new
ReferenceConfig will connect, so the connect session size also = 5 * n
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