Zhijie Shen updated YARN-3374:
    Attachment: YARN-3347.1.patch

With the discovery service, the collector doesn't need to bind a configured 
port. And in the future, in a single app-level collector mode, we can't 
configure all collectors on one host to bind the same port. Therefore, I create 
patch to make the collector randomly bind an available port.  I add a test case 
to verify a good port is picked randomly. Also, I've verified that the 
distributed shell is working properly.

> Collector's web server should randomly bind an available port
> -------------------------------------------------------------
>                 Key: YARN-3374
>                 URL: https://issues.apache.org/jira/browse/YARN-3374
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>         Attachments: YARN-3347.1.patch
> It's based on the configuration now. The approach won't work if we move to 
> app-level aggregator container solution. On NM my start multiple such 
> aggregators, which cannot bind to the same configured port.

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