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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.
*/
// Must be in akka.actor package as ActorSystemImpl is protected[akka].
package akka.actor
import scala.util.control.{ControlThrowable, NonFatal}
import com.typesafe.config.Config
/**
* An akka.actor.ActorSystem which refuses to shut down in the event of a fatal exception
* This is necessary as Spark Executors are allowed to recover from fatal exceptions
* (see org.apache.spark.executor.Executor)
*/
object IndestructibleActorSystem {
def apply(name: String, config: Config): ActorSystem =
apply(name, config, ActorSystem.findClassLoader())
def apply(name: String, config: Config, classLoader: ClassLoader): ActorSystem =
new IndestructibleActorSystemImpl(name, config, classLoader).start()
}
private[akka] class IndestructibleActorSystemImpl(
override val name: String,
applicationConfig: Config,
classLoader: ClassLoader)
extends ActorSystemImpl(name, applicationConfig, classLoader) {
protected override def uncaughtExceptionHandler: Thread.UncaughtExceptionHandler = {
val fallbackHandler = super.uncaughtExceptionHandler
new Thread.UncaughtExceptionHandler() {
def uncaughtException(thread: Thread, cause: Throwable): Unit = {
if (isFatalError(cause) && !settings.JvmExitOnFatalError) {
log.error(cause, "Uncaught fatal error from thread [{}] not shutting down " +
"ActorSystem [{}] tolerating and continuing.... ", thread.getName, name)
//shutdown() //TODO make it configurable
} else {
fallbackHandler.uncaughtException(thread, cause)
}
}
}
}
def isFatalError(e: Throwable): Boolean = {
e match {
case NonFatal(_) | _: InterruptedException | _: NotImplementedError | _: ControlThrowable =>
false
case _ =>
true
}
}
}
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