winflex

Results 2 issues of winflex

![选区_072](https://user-images.githubusercontent.com/11677270/56636496-8fcc3680-669b-11e9-9e89-13fe1e357d92.png) ![选区_073](https://user-images.githubusercontent.com/11677270/56636497-9064cd00-669b-11e9-943b-3f7b6ef68f7f.png) 重现过程:只需一个线程持续发SetRequest,为了加剧内存上升的过程,把value设的比较大,例如1k,持续一会后jvm就崩了。 猜测:Segment里面有个entries的list,只add没有remove,相当于把报文都存到内存了

- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate. - [x] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe...