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/*
* 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
import java.net.Socket
import py4j.GatewayServer
import org.apache.spark.internal.Logging
import org.apache.spark.util.Utils
/**
* Process that starts a Py4J GatewayServer on an ephemeral port and communicates the bound port
* back to its caller via a callback port specified by the caller.
*
* 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 = Utils.tryOrExit {
// Start a GatewayServer on an ephemeral port
val gatewayServer: GatewayServer = new GatewayServer(null, 0)
gatewayServer.start()
val boundPort: Int = gatewayServer.getListeningPort
if (boundPort == -1) {
logError("GatewayServer failed to bind; exiting")
System.exit(1)
} else {
logDebug(s"Started PythonGatewayServer on port $boundPort")
}
// Communicate the bound port back to the caller via the caller-specified callback port
val callbackHost = sys.env("_PYSPARK_DRIVER_CALLBACK_HOST")
val callbackPort = sys.env("_PYSPARK_DRIVER_CALLBACK_PORT").toInt
logDebug(s"Communicating GatewayServer port to Python driver at $callbackHost:$callbackPort")
val callbackSocket = new Socket(callbackHost, callbackPort)
val dos = new DataOutputStream(callbackSocket.getOutputStream)
dos.writeInt(boundPort)
dos.close()
callbackSocket.close()
// 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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