gRPC Python sets the SO_REUSEADDR option on server sockets, which allows multiple servers to bind to the same port.
On Mon, Sep 4, 2017 at 5:58 AM, Amit Saha <[email protected]> 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. > > -- > You received this message because you are subscribed to the Google Groups " > grpc.io" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/grpc-io. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/grpc-io/7bef9f00-c9fa-4cdc-91c7-c3555c177c9a%40googlegroups.com > <https://groups.google.com/d/msgid/grpc-io/7bef9f00-c9fa-4cdc-91c7-c3555c177c9a%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "grpc.io" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/grpc-io. To view this discussion on the web visit https://groups.google.com/d/msgid/grpc-io/CAGm2-Y5xLvNKSqyPo6zzHBi6JHVZADSrJ5BNfJ12AjS%3D%3D2UijQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
