srowen commented on a change in pull request #26955: [SPARK-30310] [Core] 
Resolve missing match case in SparkUncaughtExceptionHandler and added tests
URL: https://github.com/apache/spark/pull/26955#discussion_r363769350
 
 

 ##########
 File path: 
core/src/main/scala/org/apache/spark/util/SparkUncaughtExceptionHandler.scala
 ##########
 @@ -48,11 +48,17 @@ private[spark] class SparkUncaughtExceptionHandler(val 
exitOnUncaughtException:
             System.exit(SparkExitCode.OOM)
           case _ if exitOnUncaughtException =>
             System.exit(SparkExitCode.UNCAUGHT_EXCEPTION)
+          case _ =>
+            // SPARK-30310: Don't System.exit() when exitOnUncaughtException 
is false
         }
       }
     } catch {
-      case oom: OutOfMemoryError => Runtime.getRuntime.halt(SparkExitCode.OOM)
-      case t: Throwable => 
Runtime.getRuntime.halt(SparkExitCode.UNCAUGHT_EXCEPTION_TWICE)
+      case oom: OutOfMemoryError =>
+        logError(s"Uncaught OutOfMemoryError in thread $thread, process 
halted.", oom)
 
 Review comment:
   Why would logging not succeed here?
   This still halts. I think it avoids masking the OOM with a MatchError.

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