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https://issues.apache.org/jira/browse/SPARK-11765?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-11765.
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    Resolution: Not A Problem

Agree, I don't think this is something that needs any change, as you can always 
specify the port you want.

> Avoid assign UI port between browser unsafe ports (or just 4045: lockd)
> -----------------------------------------------------------------------
>
>                 Key: SPARK-11765
>                 URL: https://issues.apache.org/jira/browse/SPARK-11765
>             Project: Spark
>          Issue Type: Improvement
>            Reporter: Jungtaek Lim
>            Priority: Minor
>
> Spark UI port starts on 4040, and UI port is incremented by 1 for every 
> confliction.
> In our use case, we have some drivers running at the same time, which makes 
> UI port to be assigned to 4045, which is treated to unsafe port for chrome 
> and mozilla.
> http://src.chromium.org/viewvc/chrome/trunk/src/net/base/net_util.cc?view=markup
> http://www-archive.mozilla.org/projects/netlib/PortBanning.html#portlist
> We would like to avoid assigning UI to these ports, or just avoid assigning 
> UI port to 4045 which is too close to default port.
> If we'd like to accept this idea, I'm happy to work on it.



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