MaxGekk commented on issue #23727: [SPARK-26817][CORE] Use System.nanoTime to measure time intervals URL: https://github.com/apache/spark/pull/23727#issuecomment-462156381 There is an interesting NPE in logs but it is not clear how it is related to this changes: ``` java.lang.NullPointerException at org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend$DriverEndpoint.org$apache$spark$scheduler$cluster$CoarseGrainedSchedulerBackend$DriverEndpoint$$makeOffers(CoarseGrainedSchedulerBackend.scala:267) at org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend$DriverEndpoint$$anonfun$receive$1.applyOrElse(CoarseGrainedSchedulerBackend.scala:155) at org.apache.spark.rpc.netty.Inbox.$anonfun$process$1(Inbox.scala:117) at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:205) at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:102) at org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:222) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) ```
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