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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