Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/21342#discussion_r189753488 --- Diff: core/src/main/scala/org/apache/spark/util/SparkFatalException.scala --- @@ -0,0 +1,24 @@ +/* + * 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.util + +/** + * SPARK-24294: To bypass scala bug: https://github.com/scala/bug/issues/9554, we catch + * fatal throwable in {@link scala.concurrent.Future}'s body, and re-throw + * SparkFatalException, which wraps the fatal throwable inside. + */ +private[spark] final class SparkFatalException(val throwable: Throwable) extends Exception --- End diff -- Are there places where we fetch results from Futures without going through the `ThreadUtils.awaitResult`? In other words, is that a narrow waist? Would it make sense to add a second redundant layer of unwrapping at the top of `SparkUncaughtExceptionHandler` to handle that case? Not sure yet, but just thinking aloud here.
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