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After putting a basic ThreadingUDPServer under load (500 messages per/second) I noticed that after a night it was consuming a lot of RAM given it does nothing with the data.
On inception, I noticed the _thread count inside the server was growing forever even though the sub-threads are done.
Setup a basic ThreadingUDPSever with handler that does nothing and check the request_queue_size, it seems to grow without limit.

The only way I could figure out to control it was to do this in a thread;
 for thread in server._threads: # type: Thread
 if not thread.is_alive():
 server._threads.remove(thread)
Shouldn't the server process do this when the thread is done?

This issue is a duplicate of bpo-37193.