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[RFC] SPARK-1772 Stop catching Throwable, let Executors die
The main issue this patch fixes is [SPARK-1772](https://issues.apache.org/jira/browse/SPARK-1772), in which Executors may not die when fatal exceptions (e.g., OOM) are thrown. This patch causes Executors to delegate to the ExecutorUncaughtExceptionHandler when a fatal exception is thrown. This patch also continues the fight in the neverending war against `case t: Throwable =>`, by only catching Exceptions in many places, and adding a wrapper for Threads and Runnables to make sure any uncaught exceptions are at least printed to the logs. It also turns out that it is unlikely that the IndestructibleActorSystem actually works, given testing ([here](https://gist.github.com/aarondav/ca1f0cdcd50727f89c0d)). The uncaughtExceptionHandler is not called from the places that we expected it would be. [SPARK-1620](https://issues.apache.org/jira/browse/SPARK-1620) deals with part of this issue, but refactoring our Actor Systems to ensure that exceptions are dealt with properly is a much bigger change, outside the scope of this PR.
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53 changes: 53 additions & 0 deletions
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core/src/main/scala/org/apache/spark/executor/ExecutorUncaughtExceptionHandler.scala
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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. | ||
*/ | ||
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package org.apache.spark.executor | ||
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import org.apache.spark.Logging | ||
import org.apache.spark.util.Utils | ||
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/** | ||
* The default uncaught exception handler for Executors terminates the whole process, to avoid | ||
* getting into a bad state indefinitely. Since Executors are relatively lightweight, it's better | ||
* to fail fast when things go wrong. | ||
*/ | ||
private[spark] object ExecutorUncaughtExceptionHandler | ||
extends Thread.UncaughtExceptionHandler with Logging { | ||
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override def uncaughtException(thread: Thread, exception: Throwable) { | ||
try { | ||
logError("Uncaught exception in thread " + thread, exception) | ||
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// We may have been called from a shutdown hook. If so, we must not call System.exit(). | ||
// (If we do, we will deadlock.) | ||
if (!Utils.inShutdown()) { | ||
if (exception.isInstanceOf[OutOfMemoryError]) { | ||
System.exit(ExecutorExitCode.OOM) | ||
} else { | ||
System.exit(ExecutorExitCode.UNCAUGHT_EXCEPTION) | ||
} | ||
} | ||
} catch { | ||
case oom: OutOfMemoryError => Runtime.getRuntime.halt(ExecutorExitCode.OOM) | ||
case t: Throwable => Runtime.getRuntime.halt(ExecutorExitCode.UNCAUGHT_EXCEPTION_TWICE) | ||
} | ||
} | ||
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def uncaughtException(exception: Throwable) { | ||
uncaughtException(Thread.currentThread(), exception) | ||
} | ||
} |
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