Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/6262#discussion_r32776469
--- Diff: python/pyspark/rdd.py ---
@@ -704,7 +704,12 @@ def pipe_objs(out):
out.write(s.encode('utf-8'))
out.close()
Thread(target=pipe_objs, args=[pipe.stdin]).start()
- return (x.rstrip(b'\n').decode('utf-8') for x in
iter(pipe.stdout.readline, b''))
+ result = (x.rstrip(b'\n').decode('utf-8') for x in
iter(pipe.stdout.readline, b''))
+ pipe.wait()
--- End diff --
While waiting, the stdout of subprocess is not consumed, it may block the
subprocess, causing dead lock.
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