Bug: Error loading the stages/stage/<id> page in spark UI
Status: Resolved | Priority: Major | Resolution: Not A Bug
Created: 18/Jun/21 01:18
Affects Version/s: 3.0.0

I try to load the sparkUI page for a specific stage, I get the following error:
{quote}Unable to connect to the server. Looks like the Spark application must have ended. Please Switch to the history UI.
{quote}
Obviously the server is still alive and process new messages.

Looking at the network tab shows one of the requests fails:

 

{{curl 'http://<my-host-url>:8080/proxy/app-20201008130147-0001/api/v1/applications/app-20201008130147-0001/stages/11/0/taskTable'

<html>
 <head>
 <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
 <title>Error 500 Request failed.</title>
 </head>
 <body><h2>HTTP ERROR 500</h2>
 <p>Problem accessing /api/v1/applications/app-20201008130147-0001/stages/11/0/taskTable. Reason:
 <pre> Request failed.</pre></p><hr><a href="http://eclipse.org/jetty">Powered by Jetty:// 9.4.z-SNAPSHOT</a><hr/>

</body>
 </html>}}

requests to any other object that I've tested seem to work, for example

 

{{curl 'http://<my-host-url>:8080/proxy/app-20201008130147-0001/api/v1/applications/app-20201008130147-0001/stages/11/0/taskSummary'}}

 

The exception is:

{{/api/v1/applications/app-20201008130147-0001/stages/11/0/taskTable
 javax.servlet.ServletException: java.lang.NullPointerException
 at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:410)
 at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346)
 at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:366)
 at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:319)
 at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205)
 at org.sparkproject.jetty.servlet.ServletHolder.handle(ServletHolder.java:873)
 at org.sparkproject.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1623)
 at org.apache.spark.ui.HttpSecurityFilter.doFilter(HttpSecurityFilter.scala:95)
 at org.sparkproject.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
 at org.sparkproject.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540)
 at org.sparkproject.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
 at org.sparkproject.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345)
 at org.sparkproject.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
 at org.sparkproject.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)
 at org.sparkproject.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
 at org.sparkproject.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247)
 at org.sparkproject.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
 at org.sparkproject.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:753)
 at org.sparkproject.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:220)
 at org.sparkproject.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
 at org.sparkproject.jetty.server.Server.handle(Server.java:505)
 at org.sparkproject.jetty.server.HttpChannel.handle(HttpChannel.java:370)
 at org.sparkproject.jetty.server.HttpConnection.onFillable(HttpConnection.java:267)
 at org.sparkproject.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
 at org.sparkproject.jetty.io.FillInterest.fillable(FillInterest.java:103)
 at org.sparkproject.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
 at org.sparkproject.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
 at org.sparkproject.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
 at org.sparkproject.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
 at org.sparkproject.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
 at org.sparkproject.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
 at org.sparkproject.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:698)
 at org.sparkproject.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:804)
 at java.lang.Thread.run(Thread.java:748)
 Caused by: java.lang.NullPointerException
 at org.apache.spark.status.api.v1.StagesResource.$anonfun$doPagination$1(StagesResource.scala:175)
 at org.apache.spark.status.api.v1.BaseAppResource.$anonfun$withUI$1(ApiRootResource.scala:140)
 at org.apache.spark.ui.SparkUI.withSparkUI(SparkUI.scala:107)
 at org.apache.spark.status.api.v1.BaseAppResource.withUI(ApiRootResource.scala:135)
 at org.apache.spark.status.api.v1.BaseAppResource.withUI$(ApiRootResource.scala:133)
 at org.apache.spark.status.api.v1.StagesResource.withUI(StagesResource.scala:28)
 at org.apache.spark.status.api.v1.StagesResource.doPagination(StagesResource.scala:174)
 at org.apache.spark.status.api.v1.StagesResource.$anonfun$taskTable$1(StagesResource.scala:129)
 at org.apache.spark.status.api.v1.BaseAppResource.$anonfun$withUI$1(ApiRootResource.scala:140)
 at org.apache.spark.ui.SparkUI.withSparkUI(SparkUI.scala:107)
 at org.apache.spark.status.api.v1.BaseAppResource.withUI(ApiRootResource.scala:135)
 at org.apache.spark.status.api.v1.BaseAppResource.withUI$(ApiRootResource.scala:133)
 at org.apache.spark.status.api.v1.StagesResource.withUI(StagesResource.scala:28)
 at org.apache.spark.status.api.v1.StagesResource.taskTable(StagesResource.scala:113)
 at sun.reflect.GeneratedMethodAccessor707.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:498)
 at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52)
 at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:124)
 at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:167)
 at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:219)
 at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:79)
 at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:469)
 at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:391)
 at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:80)
 at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:253)
 at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248)
 at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244)
 at org.glassfish.jersey.internal.Errors.process(Errors.java:292)
 at org.glassfish.jersey.internal.Errors.process(Errors.java:274)
 at org.glassfish.jersey.internal.Errors.process(Errors.java:244)
 at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265)
 at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:232)
 at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:680)
 at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:394)
 ... 33 more}}