7fe08b43c7
When JVM is started in a Python process, it should exit once the stdin is closed. test: add spark.driver.memory in conf/spark-defaults.conf ``` daviesdm:~/work/spark$ cat conf/spark-defaults.conf spark.driver.memory 8g daviesdm:~/work/spark$ bin/pyspark >>> quit daviesdm:~/work/spark$ jps 4931 Jps 286 daviesdm:~/work/spark$ python wc.py 943738 0.719928026199 daviesdm:~/work/spark$ jps 286 4990 Jps ``` Author: Davies Liu <davies@databricks.com> Closes #3274 from davies/exit and squashes the following commits: df0e524 [Davies Liu] address comments ce8599c [Davies Liu] address comments 050651f [Davies Liu] JVM should exit after Python exit
121 lines
5.6 KiB
Python
121 lines
5.6 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 atexit
|
|
import os
|
|
import sys
|
|
import signal
|
|
import shlex
|
|
import platform
|
|
from subprocess import Popen, PIPE
|
|
from threading import Thread
|
|
from py4j.java_gateway import java_import, JavaGateway, GatewayClient
|
|
|
|
|
|
def launch_gateway():
|
|
SPARK_HOME = os.environ["SPARK_HOME"]
|
|
|
|
gateway_port = -1
|
|
if "PYSPARK_GATEWAY_PORT" in os.environ:
|
|
gateway_port = int(os.environ["PYSPARK_GATEWAY_PORT"])
|
|
else:
|
|
# Launch the Py4j gateway using Spark's run command so that we pick up the
|
|
# proper classpath and settings from spark-env.sh
|
|
on_windows = platform.system() == "Windows"
|
|
script = "./bin/spark-submit.cmd" if on_windows else "./bin/spark-submit"
|
|
submit_args = os.environ.get("PYSPARK_SUBMIT_ARGS")
|
|
submit_args = submit_args if submit_args is not None else ""
|
|
submit_args = shlex.split(submit_args)
|
|
command = [os.path.join(SPARK_HOME, script)] + submit_args + ["pyspark-shell"]
|
|
if not on_windows:
|
|
# Don't send ctrl-c / SIGINT to the Java gateway:
|
|
def preexec_func():
|
|
signal.signal(signal.SIGINT, signal.SIG_IGN)
|
|
env = dict(os.environ)
|
|
env["IS_SUBPROCESS"] = "1" # tell JVM to exit after python exits
|
|
proc = Popen(command, stdout=PIPE, stdin=PIPE, preexec_fn=preexec_func, env=env)
|
|
else:
|
|
# preexec_fn not supported on Windows
|
|
proc = Popen(command, stdout=PIPE, stdin=PIPE)
|
|
|
|
try:
|
|
# Determine which ephemeral port the server started on:
|
|
gateway_port = proc.stdout.readline()
|
|
gateway_port = int(gateway_port)
|
|
except ValueError:
|
|
# Grab the remaining lines of stdout
|
|
(stdout, _) = proc.communicate()
|
|
exit_code = proc.poll()
|
|
error_msg = "Launching GatewayServer failed"
|
|
error_msg += " with exit code %d!\n" % exit_code if exit_code else "!\n"
|
|
error_msg += "Warning: Expected GatewayServer to output a port, but found "
|
|
if gateway_port == "" and stdout == "":
|
|
error_msg += "no output.\n"
|
|
else:
|
|
error_msg += "the following:\n\n"
|
|
error_msg += "--------------------------------------------------------------\n"
|
|
error_msg += gateway_port + stdout
|
|
error_msg += "--------------------------------------------------------------\n"
|
|
raise Exception(error_msg)
|
|
|
|
# In Windows, ensure the Java child processes do not linger after Python has exited.
|
|
# In UNIX-based systems, the child process can kill itself on broken pipe (i.e. when
|
|
# the parent process' stdin sends an EOF). In Windows, however, this is not possible
|
|
# because java.lang.Process reads directly from the parent process' stdin, contending
|
|
# with any opportunity to read an EOF from the parent. Note that this is only best
|
|
# effort and will not take effect if the python process is violently terminated.
|
|
if on_windows:
|
|
# In Windows, the child process here is "spark-submit.cmd", not the JVM itself
|
|
# (because the UNIX "exec" command is not available). This means we cannot simply
|
|
# call proc.kill(), which kills only the "spark-submit.cmd" process but not the
|
|
# JVMs. Instead, we use "taskkill" with the tree-kill option "/t" to terminate all
|
|
# child processes in the tree (http://technet.microsoft.com/en-us/library/bb491009.aspx)
|
|
def killChild():
|
|
Popen(["cmd", "/c", "taskkill", "/f", "/t", "/pid", str(proc.pid)])
|
|
atexit.register(killChild)
|
|
|
|
# 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=gateway_port), auto_convert=False)
|
|
|
|
# Import the classes used by PySpark
|
|
java_import(gateway.jvm, "org.apache.spark.SparkConf")
|
|
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, "org.apache.spark.sql.SQLContext")
|
|
java_import(gateway.jvm, "org.apache.spark.sql.hive.HiveContext")
|
|
java_import(gateway.jvm, "org.apache.spark.sql.hive.LocalHiveContext")
|
|
java_import(gateway.jvm, "org.apache.spark.sql.hive.TestHiveContext")
|
|
java_import(gateway.jvm, "scala.Tuple2")
|
|
|
|
return gateway
|