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https://issues.apache.org/jira/browse/YARN-4763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15182469#comment-15182469
]
Rohith Sharma K S commented on YARN-4763:
-----------------------------------------
As I see this issue is not because of rmappattempt is in NEW state where as
Attempt itself is not created yet. In such case, application report send
current attempt id by using dummy application attempt number. This time period
is very very small may be fraction of seconds!!
{code}
if (currentApplicationAttemptId == null) {
currentApplicationAttemptId =
BuilderUtils.newApplicationAttemptId(this.applicationId,
DUMMY_APPLICATION_ATTEMPT_NUMBER);
}
{code}
> RMApps Page crashes with NPE
> ----------------------------
>
> Key: YARN-4763
> URL: https://issues.apache.org/jira/browse/YARN-4763
> Project: Hadoop YARN
> Issue Type: Bug
> Components: webapp
> Reporter: Bibin A Chundatt
> Assignee: Bibin A Chundatt
> Fix For: 2.9.0
>
> Attachments: 0001-YARN-4763.patch
>
>
> {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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