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  1. ,

    In Scala, don’t use the get method with Option to access a result. Use getOrElse, a match expression, or foreach instead.

java.util.NoSuchElementException: None.get	at scala.None$.get(Option.scala:313)	at scala.None$.get(Option.scala:311)	at org.apache.spark.ui.jobs.StagePage.taskRow(StagePage.scala:331)	at org.apache.spark.ui.jobs.StagePage$$anonfun$8.apply(StagePage.scala:173)	at org.apache.spark.ui.jobs.StagePage$$anonfun$8.apply(StagePage.scala:173)	at org.apache.spark.ui.UIUtils$$anonfun$listingTable$2.apply(UIUtils.scala:282)	at org.apache.spark.ui.UIUtils$$anonfun$listingTable$2.apply(UIUtils.scala:282)	at scala.collection.immutable.Stream.map(Stream.scala:376)	at org.apache.spark.ui.UIUtils$.listingTable(UIUtils.scala:282)	at org.apache.spark.ui.jobs.StagePage.render(StagePage.scala:171)	at org.apache.spark.ui.WebUI$$anonfun$attachPage$1.apply(WebUI.scala:68)	at org.apache.spark.ui.WebUI$$anonfun$attachPage$1.apply(WebUI.scala:68)	at org.apache.spark.ui.JettyUtils$$anon$1.doGet(JettyUtils.scala:68)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1496)	at org.apache.hadoop.yarn.server.webproxy.amfilter.AmIpFilter.doFilter(AmIpFilter.java:164)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)	at org.eclipse.jetty.server.Server.handle(Server.java:370)	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)	at java.lang.Thread.run(Thread.java:722)