Github user AiHe commented on a diff in the pull request: https://github.com/apache/spark/pull/6338#discussion_r33499870 --- Diff: python/pyspark/rdd.py --- @@ -121,15 +121,30 @@ def _parse_memory(s): def _load_from_socket(port, serializer): - sock = socket.socket() - sock.settimeout(3) - try: - sock.connect(("localhost", port)) - rf = sock.makefile("rb", 65536) - for item in serializer.load_stream(rf): - yield item - finally: - sock.close() + sock = None + # Support for both IPv4 and IPv6. + # On most of IPv6-ready systems, IPv6 will take precedence. + for res in socket.getaddrinfo("localhost", port, socket.AF_UNSPEC, socket.SOCK_STREAM): + af, socktype, proto, canonname, sa = res + try: + sock = socket.socket(af, socktype, proto) + sock.settimeout(3) + sock.connect(sa) + except socket.error: + sock = None + continue + break + if sock: + try: + rf = sock.makefile("rb", 65536) + for item in serializer.load_stream(rf): + yield item + except socket.error: + raise Exception("encounter error when connecting to socket server") + finally: + sock.close() + else: + raise Exception("could not open socket") --- End diff -- Hi Davies, you mean the "else branch"? I think it will throw the exception once connections in both IPV4 and IPV6 cannot be established. What's the benefit to move the "else" branch?
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