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