[jira] [Commented] (YARN-4763) RMApps Page crashes with NPE

["Sunil G (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-4763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15180197#comment-15180197 ] 

Sunil G commented on YARN-4763:
-------------------------------

{code}
      String blacklistedNodesCount = "N/A";
      Set<String> nodes = rm.getRMContext().getRMApps()
          .get(appAttemptId.getApplicationId()).getAppAttempts()
          .get(appAttemptId).getBlacklistedNodes();
      if (nodes != null) {
        blacklistedNodesCount = String.valueOf(nodes.size());
      }
{code}

This code will cause pblm. This will cause exception as attempt was not created in initial states such as NEW, NEW_SAVING etc. And we can reproduce this pblm by placing a debug point in RMAppImpl. 

Can u share a patch for this? [~rohithsharma] cud u pls take a look.

> RMApps Page crashes with NPE
> ----------------------------
>
>                 Key: YARN-4763
>                 URL: https://issues.apache.org/jira/browse/YARN-4763
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Bibin A Chundatt
>            Assignee: Bibin A Chundatt
>
> {noformat}
> =application_1457010932347_0121
> 2016-03-04 10:16:27,016 INFO org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer: application_1457010932347_0121 found existing hdfs token Kind: HDFS_DELEGATION_TOKEN, Service: ha-hdfs:hacluster, Ident: (HDFS_DELEGATION_TOKEN token 128 for yarn with renewer yarn)
> 2016-03-04 10:16:27,029 ERROR org.apache.hadoop.yarn.webapp.Dispatcher: error handling URI: /cluster/apps
> java.lang.NullPointerException
>         at org.apache.hadoop.yarn.server.resourcemanager.webapp.RMAppsBlock.renderData(RMAppsBlock.java:100)
>         at org.apache.hadoop.yarn.server.webapp.AppsBlock.render(AppsBlock.java:140)
>         at org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:69)
>         at org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:79)
>         at org.apache.hadoop.yarn.webapp.View.render(View.java:235)
>         at org.apache.hadoop.yarn.webapp.view.HtmlBlock$Block.subView(HtmlBlock.java:43)
>         at org.apache.hadoop.yarn.webapp.hamlet.Hamlet._(Hamlet.java:30354)
>         at org.apache.hadoop.yarn.server.resourcemanager.webapp.AppsBlockWithMetrics.render(AppsBlockWithMetrics.java:30)
>         at org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:69)
>         at org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:79)
>         at org.apache.hadoop.yarn.webapp.View.render(View.java:235)
>         at org.apache.hadoop.yarn.webapp.view.HtmlPage$Page.subView(HtmlPage.java:49)
>         at org.apache.hadoop.yarn.webapp.hamlet.HamletImpl$EImp._v(HamletImpl.java:117)
>         at org.apache.hadoop.yarn.webapp.hamlet.Hamlet$TD._(Hamlet.java:848)
>         at org.apache.hadoop.yarn.webapp.view.TwoColumnLayout.render(TwoColumnLayout.java:71)
>         at org.apache.hadoop.yarn.webapp.view.HtmlPage.render(HtmlPage.java:82)
>         at org.apache.hadoop.yarn.webapp.Dispatcher.render(Dispatcher.java:197)
>         at org.apache.hadoop.yarn.webapp.Dispatcher.service(Dispatcher.java:156)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>         at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)
> {noformat}
> Application state is NEW the apptempts can be empty as per inital analysis
> {noformat}
> rm.getRMContext().getRMApps()
>           .get(appAttemptId.getApplicationId()).getAppAttempts()
>           .get(appAttemptId)
> {noformat}



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