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[SPARK-2244] Fix hang introduced by SPARK-1466 #1197

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[SPARK-2244] Fix hang introduced by SPARK-1466 #1197

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4 changes: 4 additions & 0 deletions python/pyspark/java_gateway.py
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,10 @@ def preexec_func():
raise Exception("Launching GatewayServer failed with exit code %d: %s" %
(error_code, "".join(proc.stderr.readlines())))

# close stderr, otherwise it fills an internal buffer and causes SPARK-2244
# TODO: work out a -verbose option and create EchoOutputThread(proc.stderr).start() instead
proc.stderr.close()

# Create a thread to echo output from the GatewayServer, which is required
# for Java log output to show up:
class EchoOutputThread(Thread):
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