On Tue, 5 Sep 2017 at 6:44 am, Ken Payson <kpay...@google.com> wrote:
> gRPC Python sets the SO_REUSEADDR option on server sockets, which allows
> multiple servers to bind to the same port.
>
Thanks. Is there any reason why this is set to be the default behavior?
> On Mon, Sep 4, 2017 at 5:58 AM, Amit Saha <amitsaha...@gmail.com> wrote:
>
>> Hey all,
>>
>> This is the relevant part of my server:
>>
>> def serve():
>> server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
>> users_service.add_UsersServicer_to_server(UsersService(), server)
>> res = server.add_insecure_port('127.0.0.1:50051')
>> server.start()
>> try:
>> while True:
>> time.sleep(_ONE_DAY_IN_SECONDS)
>> except KeyboardInterrupt:
>> server.stop(0)
>>
>>
>> On OS X, by mistake i started the server twice in different terminal
>> sessions and I expected it to fail the second time (address already bound,
>> etc). However, it didn't error out and this is what I see via lsof:
>>
>> $ sudo lsof -iTCP:50051
>>
>> COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
>> Python 12120 amit 4u IPv6 0xffbffb1742aa0f0f 0t0 TCP
>> localhost:50051 (LISTEN)
>> Python 12157 amit 4u IPv6 0xffbffb1742aa144f 0t0 TCP
>> localhost:50051 (LISTEN)
>>
>> Curiously enough, they both have the same FD.
>>
>> (I verified it with a Flask application to see if it was something Python
>> specific, and i do see the expected error message when I try to start a
>> second instance of the same)
>>
>> Thanks for any hints in advance.
>>
>> Best Wishes,
>> Amit.
>>
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