[GitHub] [arrow] lupko commented on issue #11932: [Python] Unable to turn-off signal blocking for pyarrow flight RPC server

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lupko commented on issue #11932:
URL: https://github.com/apache/arrow/issues/11932#issuecomment-992609540


   I run into this problem as well. What happens in my case is FlightServerBase will install its own handlers for INT & TERM. Upon those signals, none of the previously installed handlers will be called (even if it seems the code intends to do so?); Flight RPC server shuts down on those signals.
   
   Anyway, what seems like a workaround to me is to:
   
   1. set both SIGTERM and SIGINT to SIG_IGN - this way pyarrow will not register its own signal handlers (https://github.com/apache/arrow/blob/master/cpp/src/arrow/python/flight.cc#L181)
   2. start the server in separate thread, once up, install your own handlers in the main thread
   3. in your own handlers trigger shutdown explicitly; once shutdown is done blocking, the serve() will exit as well
   
   Disclaimer: i'm a newbie in pyarrow/Flight so maybe this is not 100% correct and leads to problems down the line.
   
   @lidavidm i'm curious, how about exposing the Serve() for applications that want/need to do their own signal processing and control the Flight RPC server lifecycle themselves? Seems like the underlying C++ impl has methods to do Serve() and ServeWithSignals() but python only exposes the latter.
   
   Thanks


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