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https://issues.apache.org/jira/browse/SPARK-2169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14046468#comment-14046468
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Marcelo Vanzin commented on SPARK-2169:
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https://github.com/apache/spark/pull/1252
> SparkUI.setAppName() has no effect
> ----------------------------------
>
> Key: SPARK-2169
> URL: https://issues.apache.org/jira/browse/SPARK-2169
> Project: Spark
> Issue Type: Bug
> Components: Web UI
> Affects Versions: 1.0.0
> Reporter: Marcelo Vanzin
>
> {{SparkUI.setAppName()}} does not do anything useful.
> It overwrites the instance's {{appName}} fields, but all places where that
> field is used have already read that value into their own copies by the time
> that happens.
> e.g.
> StagePage.scala copies {{parent.appName}} into its own private {{appName}} in
> the constructor, which is called as part of SparkUI's constructor. So when
> you call {{SparkUI.setAppName}} it does not overwrite StagePage's copy, and
> so the UI still shows the old value.
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