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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