Hi, all I noticed that @cvictory made a very good issue[1], I think we can have more discussion, so I brought it here:
There are so much threadpool that manage only one thread , and this thread is idle. The threadpool as follow: * org.apache.dubbo.metadata.support.AbstractMetadataReport#reportCacheExecutor for asyn write metadata. * The HashedWheelTimer is used in Registry retry task. * Configcenter listen the config changed, and the callback will excuted by a dependency Executor. .... There are so much situation that we will use threadpool. I think can we merge this threadpool to make the threadpool is used by much more situation. Also we should move some timer task to HashedWheelTimer? [1] https://github.com/apache/incubator-dubbo/issues/3616
