Failed to register signal handler for PWR

20/03/02 14:25:44 INFO SignalUtils: Registering signal handler for PWR
20/03/02 14:25:44 WARN SignalUtils: Failed to register signal handler for PWR
java.lang.IllegalArgumentException: Unknown signal: PWR
	at sun.misc.Signal.<init>(Signal.java:143)
	at org.apache.spark.util.SignalUtils$.$anonfun$register$1(SignalUtils.scala:64)
	at scala.collection.mutable.HashMap.getOrElseUpdate(HashMap.scala:86)
	at org.apache.spark.util.SignalUtils$.register(SignalUtils.scala:62)
	at org.apache.spark.executor.CoarseGrainedExecutorBackend.onStart(CoarseGrainedExecutorBackend.scala:85)
	at org.apache.spark.rpc.netty.Inbox.$anonfun$process$1(Inbox.scala:120)
	at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:203)
	at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:100)
	at org.apache.spark.rpc.netty.MessageLoop.org$apache$spark$rpc$netty$MessageLoop$$receiveLoop(MessageLoop.scala:75)
	at org.apache.spark.rpc.netty.MessageLoop$$anon$1.run(MessageLoop.scala:41)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	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)