spark PythonGatewayServer 源码
spark PythonGatewayServer 代码
文件路径：/core/src/main/scala/org/apache/spark/api/python/PythonGatewayServer.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.io.{DataOutputStream, File, FileOutputStream}
import java.net.InetAddress
import java.nio.charset.StandardCharsets.UTF_8
import java.nio.file.Files
import org.apache.spark.SparkConf
import org.apache.spark.internal.Logging
/**
* Process that starts a Py4J server on an ephemeral port.
*
* This process is launched (via SparkSubmit) by the PySpark driver (see java_gateway.py).
*/
private[spark] object PythonGatewayServer extends Logging {
initializeLogIfNecessary(true)
def main(args: Array[String]): Unit = {
val sparkConf = new SparkConf()
val gatewayServer: Py4JServer = new Py4JServer(sparkConf)
gatewayServer.start()
val boundPort: Int = gatewayServer.getListeningPort
if (boundPort == -1) {
logError(s"${gatewayServer.server.getClass} failed to bind; exiting")
System.exit(1)
} else {
val address = InetAddress.getLoopbackAddress()
logDebug(s"Started PythonGatewayServer on $address with port $boundPort")
}
// Communicate the connection information back to the python process by writing the
// information in the requested file. This needs to match the read side in java_gateway.py.
val connectionInfoPath = new File(sys.env("_PYSPARK_DRIVER_CONN_INFO_PATH"))
val tmpPath = Files.createTempFile(connectionInfoPath.getParentFile().toPath(),
"connection", ".info").toFile()
val dos = new DataOutputStream(new FileOutputStream(tmpPath))
dos.writeInt(boundPort)
val secretBytes = gatewayServer.secret.getBytes(UTF_8)
dos.writeInt(secretBytes.length)
dos.write(secretBytes, 0, secretBytes.length)
dos.close()
if (!tmpPath.renameTo(connectionInfoPath)) {
logError(s"Unable to write connection information to $connectionInfoPath.")
System.exit(1)
}
// Exit on EOF or broken pipe to ensure that this process dies when the Python driver dies:
while (System.in.read() != -1) {
// Do nothing
}
logDebug("Exiting due to broken pipe from Python driver")
System.exit(0)
}
}
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