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https://issues.apache.org/jira/browse/SPARK-2100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14032803#comment-14032803
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Sean Owen commented on SPARK-2100:
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Tomcat and Jetty classes don't overlap -- do you mean the Servlet API classes? 
that's a different known issue.

> Allow users to disable Jetty Spark UI in local mode
> ---------------------------------------------------
>
>                 Key: SPARK-2100
>                 URL: https://issues.apache.org/jira/browse/SPARK-2100
>             Project: Spark
>          Issue Type: Improvement
>            Reporter: DB Tsai
>
> Since we want to use Spark hadoop APIs in local mode for design time to 
> explore the first couple hundred lines of data in HDFS. Also, we want to use 
> Spark in our tomcat application, so starting a jetty UI will make our tomcat 
> unhappy. In those scenarios, Spark UI is not necessary, and wasting resource. 
> As a result, for local mode, it's desirable that users are able to disable 
> the spark UI.
> Couple places I found where the jetty will be started.
> In SparkEnv.scala
> 1) val broadcastManager = new BroadcastManager(isDriver, conf, 
> securityManager)
> 2)  val httpFileServer = new HttpFileServer(securityManager)
>     httpFileServer.initialize()
> I don't know if broadcastManager is needed in local mode tho.



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