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/**
* Copyright (C) 2009-2013 Typesafe Inc. <http://www.typesafe.com>
*/
// 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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