Github user steveloughran commented on the pull request:
https://github.com/apache/spark/pull/6033#issuecomment-100917262
update: OK, with a jetty error handler set up right, exceptions are turned
into 500 errors with a `<pre>` formatted stack trace;
```
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
<title>Error 500 Server Error</title>
</head>
<body><h2>HTTP ERROR 500</h2>
<p>Problem accessing /. Reason:
<pre> Server Error</pre></p><h3>Caused
by:</h3><pre>java.net.NoRouteToHostException: No-route-to-host
at
org.apache.spark.deploy.history.yarn.failures.FailingTimelineQueryClient.innerExecAction(FailingTimelineQueryClient.scala:37)
at
org.apache.spark.deploy.history.yarn.rest.TimelineQueryClient.exec(TimelineQueryClient.scala:125)
at
org.apache.spark.deploy.history.yarn.rest.TimelineQueryClient.get(TimelineQueryClient.scala:111)
at
org.apache.spark.deploy.history.yarn.rest.TimelineQueryClient.listEntities(TimelineQueryClient.scala:223)
at
org.apache.spark.deploy.history.yarn.YarnHistoryProvider.getListing(YarnHistoryProvider.scala:137)
at
org.apache.spark.deploy.history.yarn.YarnHistoryProvider.getListing(YarnHistoryProvider.scala:51)
at
org.apache.spark.deploy.history.HistoryServer.getApplicationList(HistoryServer.scala:163)
at
org.apache.spark.deploy.history.HistoryPage.render(HistoryPage.scala:37)
at org.apache.spark.ui.WebUI$$anonfun$2.apply(WebUI.scala:79)
at org.apache.spark.ui.WebUI$$anonfun$2.apply(WebUI.scala:79)
at org.apache.spark.ui.JettyUtils$$anon$1.doGet(JettyUtils.scala:69)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at
org.spark-project.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
at
org.spark-project.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
at
org.spark-project.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at
org.spark-project.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
at
org.spark-project.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at
org.spark-project.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at
org.spark-project.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
at
org.spark-project.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.spark-project.jetty.server.Server.handle(Server.java:370)
at
org.spark-project.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
at
org.spark-project.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
at
org.spark-project.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
at
org.spark-project.jetty.http.HttpParser.parseNext(HttpParser.java:644)
at
org.spark-project.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at
org.spark-project.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at
org.spark-project.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)
at
org.spark-project.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at
org.spark-project.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at
org.spark-project.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:745)
</pre>
<hr /><i><small>Powered by Jetty://</small></i><br/>
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</body>
</html>
```
I'm changing the patch here to log & rethrow in the existing servlet
handler; set up an error handler when creating the jetty server. No tests in
this patch, but will arise in '1537.
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