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https://issues.apache.org/jira/browse/YARN-1855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13941477#comment-13941477
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Zhijie Shen commented on YARN-1855:
-----------------------------------
I did some investigation in the test failure. If I understand correctly, the
webapp of AHS overwrites the that of RM, such that testRMWebAppRedirect cannot
test the desired thing. If a NodeManager is started, its webapp will block that
of RM as well. Therefore, I create a patch, which fix the test failure by make
it configurable to start AHS or not, like RM and NM.
However, for long term, I seems that we need to improve MiniYarnCluster to make
sure different jetty webapp instances can run isolatedly in a single process.
> TestRMFailover#testRMWebAppRedirect fails in trunk
> --------------------------------------------------
>
> Key: YARN-1855
> URL: https://issues.apache.org/jira/browse/YARN-1855
> Project: Hadoop YARN
> Issue Type: Test
> Reporter: Ted Yu
> Assignee: Zhijie Shen
> Priority: Critical
> Attachments: YARN-1855.1.patch
>
>
> From https://builds.apache.org/job/Hadoop-Yarn-trunk/514/console :
> {code}
> testRMWebAppRedirect(org.apache.hadoop.yarn.client.TestRMFailover) Time
> elapsed: 5.39 sec <<< ERROR!
> java.lang.NullPointerException: null
> at
> org.apache.hadoop.yarn.client.TestRMFailover.testRMWebAppRedirect(TestRMFailover.java:269)
> {code}
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