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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.deploy.worker
import org.apache.spark.Logging
import org.apache.spark.deploy.DeployMessages.SendHeartbeat
import org.apache.spark.rpc._
/**
* Actor which connects to a worker process and terminates the JVM if the connection is severed.
* Provides fate sharing between a worker and its associated child processes.
*/
private[spark] class WorkerWatcher(override val rpcEnv: RpcEnv, workerUrl: String)
extends RpcEndpoint with Logging {
override def onStart() {
logInfo(s"Connecting to worker $workerUrl")
if (!isTesting) {
rpcEnv.asyncSetupEndpointRefByURI(workerUrl)
}
}
// Used to avoid shutting down JVM during tests
// In the normal case, exitNonZero will call `System.exit(-1)` to shutdown the JVM. In the unit
// test, the user should call `setTesting(true)` so that `exitNonZero` will set `isShutDown` to
// true rather than calling `System.exit`. The user can check `isShutDown` to know if
// `exitNonZero` is called.
private[deploy] var isShutDown = false
private[deploy] def setTesting(testing: Boolean) = isTesting = testing
private var isTesting = false
// Lets us filter events only from the worker's actor system
private val expectedAddress = RpcAddress.fromURIString(workerUrl)
private def isWorker(address: RpcAddress) = expectedAddress == address
private def exitNonZero() = if (isTesting) isShutDown = true else System.exit(-1)
override def receive: PartialFunction[Any, Unit] = {
case e => logWarning(s"Received unexpected message: $e")
}
override def onConnected(remoteAddress: RpcAddress): Unit = {
if (isWorker(remoteAddress)) {
logInfo(s"Successfully connected to $workerUrl")
}
}
override def onDisconnected(remoteAddress: RpcAddress): Unit = {
if (isWorker(remoteAddress)) {
// This log message will never be seen
logError(s"Lost connection to worker actor $workerUrl. Exiting.")
exitNonZero()
}
}
override def onNetworkError(cause: Throwable, remoteAddress: RpcAddress): Unit = {
if (isWorker(remoteAddress)) {
// These logs may not be seen if the worker (and associated pipe) has died
logError(s"Could not initialize connection to worker $workerUrl. Exiting.")
logError(s"Error was: $cause")
exitNonZero()
}
}
}
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