742c44eae6
This addresses SPARK-885, a usability issue where PySpark's Java gateway process would be killed if the user hit ctrl-c. Note that SIGINT still won't cancel the running s This fix is based on http://stackoverflow.com/questions/5045771
60 lines
2.3 KiB
Python
60 lines
2.3 KiB
Python
#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import os
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import sys
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import signal
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from subprocess import Popen, PIPE
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from threading import Thread
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from py4j.java_gateway import java_import, JavaGateway, GatewayClient
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SPARK_HOME = os.environ["SPARK_HOME"]
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def launch_gateway():
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# Launch the Py4j gateway using Spark's run command so that we pick up the
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# proper classpath and SPARK_MEM settings from spark-env.sh
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command = [os.path.join(SPARK_HOME, "run"), "py4j.GatewayServer",
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"--die-on-broken-pipe", "0"]
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# Don't send ctrl-c / SIGINT to the Java gateway:
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def preexec_function():
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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proc = Popen(command, stdout=PIPE, stdin=PIPE, preexec_fn=preexec_function)
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# Determine which ephemeral port the server started on:
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port = int(proc.stdout.readline())
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# Create a thread to echo output from the GatewayServer, which is required
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# for Java log output to show up:
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class EchoOutputThread(Thread):
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def __init__(self, stream):
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Thread.__init__(self)
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self.daemon = True
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self.stream = stream
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def run(self):
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while True:
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line = self.stream.readline()
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sys.stderr.write(line)
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EchoOutputThread(proc.stdout).start()
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# Connect to the gateway
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gateway = JavaGateway(GatewayClient(port=port), auto_convert=False)
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# Import the classes used by PySpark
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java_import(gateway.jvm, "spark.api.java.*")
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java_import(gateway.jvm, "spark.api.python.*")
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java_import(gateway.jvm, "scala.Tuple2")
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return gateway
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