spark Py4JServer 源码
spark Py4JServer 代码
文件路径：/core/src/main/scala/org/apache/spark/api/python/Py4JServer.scala
/*
* 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.
*/
package org.apache.spark.api.python
import java.net.InetAddress
import java.util.Locale
import org.apache.spark.SparkConf
import org.apache.spark.errors.SparkCoreErrors
import org.apache.spark.internal.Logging
import org.apache.spark.util.Utils
/**
* A wrapper for both GatewayServer, and ClientServer to pin Python thread to JVM thread.
*/
private[spark] class Py4JServer(sparkConf: SparkConf) extends Logging {
private[spark] val secret: String = Utils.createSecret(sparkConf)
// Launch a Py4J gateway or client server for the process to connect to; this will let it see our
// Java system properties and such
private val localhost = InetAddress.getLoopbackAddress()
private[spark] val server = if (sys.env.getOrElse(
"PYSPARK_PIN_THREAD", "true").toLowerCase(Locale.ROOT) == "true") {
new py4j.ClientServer.ClientServerBuilder()
.authToken(secret)
.javaPort(0)
.javaAddress(localhost)
.build()
} else {
new py4j.GatewayServer.GatewayServerBuilder()
.authToken(secret)
.javaPort(0)
.javaAddress(localhost)
.callbackClient(py4j.GatewayServer.DEFAULT_PYTHON_PORT, localhost, secret)
.build()
}
def start(): Unit = server match {
case clientServer: py4j.ClientServer => clientServer.startServer()
case gatewayServer: py4j.GatewayServer => gatewayServer.start()
case other => throw SparkCoreErrors.unexpectedPy4JServerError(other)
}
def getListeningPort: Int = server match {
case clientServer: py4j.ClientServer => clientServer.getJavaServer.getListeningPort
case gatewayServer: py4j.GatewayServer => gatewayServer.getListeningPort
case other => throw SparkCoreErrors.unexpectedPy4JServerError(other)
}
def shutdown(): Unit = server match {
case clientServer: py4j.ClientServer => clientServer.shutdown()
case gatewayServer: py4j.GatewayServer => gatewayServer.shutdown()
case other => throw SparkCoreErrors.unexpectedPy4JServerError(other)
}
}
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