148 lines
6.2 KiB
Python
148 lines
6.2 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 atexit
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import os
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import sys
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import select
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import signal
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import shlex
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import shutil
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import socket
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import platform
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import tempfile
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import time
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from subprocess import Popen, PIPE
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if sys.version >= '3':
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xrange = range
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from py4j.java_gateway import java_import, JavaGateway, GatewayParameters
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from pyspark.find_spark_home import _find_spark_home
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from pyspark.serializers import read_int, write_with_length, UTF8Deserializer
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def launch_gateway(conf=None):
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"""
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launch jvm gateway
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:param conf: spark configuration passed to spark-submit
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:return:
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"""
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if "PYSPARK_GATEWAY_PORT" in os.environ:
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gateway_port = int(os.environ["PYSPARK_GATEWAY_PORT"])
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gateway_secret = os.environ["PYSPARK_GATEWAY_SECRET"]
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else:
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SPARK_HOME = _find_spark_home()
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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 settings from spark-env.sh
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on_windows = platform.system() == "Windows"
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script = "./bin/spark-submit.cmd" if on_windows else "./bin/spark-submit"
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command = [os.path.join(SPARK_HOME, script)]
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if conf:
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for k, v in conf.getAll():
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command += ['--conf', '%s=%s' % (k, v)]
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submit_args = os.environ.get("PYSPARK_SUBMIT_ARGS", "pyspark-shell")
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if os.environ.get("SPARK_TESTING"):
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submit_args = ' '.join([
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"--conf spark.ui.enabled=false",
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submit_args
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])
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command = command + shlex.split(submit_args)
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# Create a temporary directory where the gateway server should write the connection
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# information.
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conn_info_dir = tempfile.mkdtemp()
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try:
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fd, conn_info_file = tempfile.mkstemp(dir=conn_info_dir)
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os.close(fd)
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os.unlink(conn_info_file)
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env = dict(os.environ)
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env["_PYSPARK_DRIVER_CONN_INFO_PATH"] = conn_info_file
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# Launch the Java gateway.
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# We open a pipe to stdin so that the Java gateway can die when the pipe is broken
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if not on_windows:
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# Don't send ctrl-c / SIGINT to the Java gateway:
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def preexec_func():
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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proc = Popen(command, stdin=PIPE, preexec_fn=preexec_func, env=env)
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else:
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# preexec_fn not supported on Windows
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proc = Popen(command, stdin=PIPE, env=env)
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# Wait for the file to appear, or for the process to exit, whichever happens first.
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while not proc.poll() and not os.path.isfile(conn_info_file):
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time.sleep(0.1)
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if not os.path.isfile(conn_info_file):
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raise Exception("Java gateway process exited before sending its port number")
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with open(conn_info_file, "rb") as info:
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gateway_port = read_int(info)
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gateway_secret = UTF8Deserializer().loads(info)
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finally:
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shutil.rmtree(conn_info_dir)
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# In Windows, ensure the Java child processes do not linger after Python has exited.
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# In UNIX-based systems, the child process can kill itself on broken pipe (i.e. when
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# the parent process' stdin sends an EOF). In Windows, however, this is not possible
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# because java.lang.Process reads directly from the parent process' stdin, contending
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# with any opportunity to read an EOF from the parent. Note that this is only best
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# effort and will not take effect if the python process is violently terminated.
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if on_windows:
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# In Windows, the child process here is "spark-submit.cmd", not the JVM itself
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# (because the UNIX "exec" command is not available). This means we cannot simply
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# call proc.kill(), which kills only the "spark-submit.cmd" process but not the
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# JVMs. Instead, we use "taskkill" with the tree-kill option "/t" to terminate all
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# child processes in the tree (http://technet.microsoft.com/en-us/library/bb491009.aspx)
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def killChild():
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Popen(["cmd", "/c", "taskkill", "/f", "/t", "/pid", str(proc.pid)])
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atexit.register(killChild)
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# Connect to the gateway
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gateway = JavaGateway(
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gateway_parameters=GatewayParameters(port=gateway_port, auth_token=gateway_secret,
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auto_convert=True))
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# Import the classes used by PySpark
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java_import(gateway.jvm, "org.apache.spark.SparkConf")
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java_import(gateway.jvm, "org.apache.spark.api.java.*")
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java_import(gateway.jvm, "org.apache.spark.api.python.*")
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java_import(gateway.jvm, "org.apache.spark.ml.python.*")
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java_import(gateway.jvm, "org.apache.spark.mllib.api.python.*")
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# TODO(davies): move into sql
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java_import(gateway.jvm, "org.apache.spark.sql.*")
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java_import(gateway.jvm, "org.apache.spark.sql.api.python.*")
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java_import(gateway.jvm, "org.apache.spark.sql.hive.*")
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java_import(gateway.jvm, "scala.Tuple2")
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return gateway
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def do_server_auth(conn, auth_secret):
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"""
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Performs the authentication protocol defined by the SocketAuthHelper class on the given
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file-like object 'conn'.
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"""
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write_with_length(auth_secret.encode("utf-8"), conn)
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conn.flush()
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reply = UTF8Deserializer().loads(conn)
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if reply != "ok":
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conn.close()
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raise Exception("Unexpected reply from iterator server.")
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