ab9128fb7e
This PR enable auto_convert in JavaGateway, then we could register a converter for a given types, for example, date and datetime. There are two bugs related to auto_convert, see [1] and [2], we workaround it in this PR. [1] https://github.com/bartdag/py4j/issues/160 [2] https://github.com/bartdag/py4j/issues/161 cc rxin JoshRosen Author: Davies Liu <davies@databricks.com> Closes #5570 from davies/py4j_date and squashes the following commits: eb4fa53 [Davies Liu] fix tests in python 3 d17d634 [Davies Liu] rollback changes in mllib 2e7566d [Davies Liu] convert tuple into ArrayList ceb3779 [Davies Liu] Update rdd.py 3c373f3 [Davies Liu] support date and datetime by auto_convert cb094ff [Davies Liu] enable auto convert
121 lines
5.4 KiB
Python
121 lines
5.4 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 socket
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import platform
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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, GatewayClient
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from py4j.java_collections import ListConverter
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from pyspark.serializers import read_int
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# patching ListConverter, or it will convert bytearray into Java ArrayList
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def can_convert_list(self, obj):
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return isinstance(obj, (list, tuple, xrange))
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ListConverter.can_convert = can_convert_list
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def launch_gateway():
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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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else:
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SPARK_HOME = os.environ["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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submit_args = os.environ.get("PYSPARK_SUBMIT_ARGS", "pyspark-shell")
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command = [os.path.join(SPARK_HOME, script)] + shlex.split(submit_args)
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# Start a socket that will be used by PythonGatewayServer to communicate its port to us
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callback_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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callback_socket.bind(('127.0.0.1', 0))
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callback_socket.listen(1)
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callback_host, callback_port = callback_socket.getsockname()
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env = dict(os.environ)
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env['_PYSPARK_DRIVER_CALLBACK_HOST'] = callback_host
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env['_PYSPARK_DRIVER_CALLBACK_PORT'] = str(callback_port)
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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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gateway_port = None
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# We use select() here in order to avoid blocking indefinitely if the subprocess dies
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# before connecting
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while gateway_port is None and proc.poll() is None:
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timeout = 1 # (seconds)
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readable, _, _ = select.select([callback_socket], [], [], timeout)
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if callback_socket in readable:
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gateway_connection = callback_socket.accept()[0]
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# Determine which ephemeral port the server started on:
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gateway_port = read_int(gateway_connection.makefile(mode="rb"))
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gateway_connection.close()
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callback_socket.close()
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if gateway_port is None:
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raise Exception("Java gateway process exited before sending the driver its port number")
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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(GatewayClient(port=gateway_port), 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.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.hive.*")
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java_import(gateway.jvm, "scala.Tuple2")
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return gateway
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