Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22218#discussion_r212964193
--- Diff:
core/src/main/scala/org/apache/spark/executor/ExecutorSource.scala ---
@@ -17,11 +17,13 @@
package org.apache.spark.executor
+import java.lang.management.ManagementFactory
import java.util.concurrent.ThreadPoolExecutor
import scala.collection.JavaConverters._
import com.codahale.metrics.{Gauge, MetricRegistry}
+import com.sun.management.OperatingSystemMXBean
--- End diff --
I think it's safest to a little reflection here to make sure this doesn't
cause the whole app to crash every time.
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