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From Markus Weimer <>
Subject Re: Question about Reef-webserver
Date Wed, 08 Oct 2014 16:05:58 GMT

mostly: What Yingda said.

Typically, we are on clusters with shared machines where one physical
machine (and IP address) hosts multiple containers. Assuming that any one
particular port is available for us isn't possible. Hence, the constructor
of HttpServerImpl tries different ports until an available one is found. In
the case of the Driver, we use the found port in order to register the
application with the resource manager to enable discovery through the RM,
which is part of the infrastructure of the cluster and therefore a known

The way HttpServerImpl  does this searchfor a port  is configurable, but it
starts with, which defaults
to 8080. If you want to start the search elsewhere, you can bind a
different value to that named parameter.

Hope this helps,


On Wed, Oct 8, 2014 at 7:15 AM, Yingda Chen <> wrote:

> We had similar discussions before, and for most usage cases, we depend on
> YARN to do the http traffic forwarding, which will automatically find the
> port used by Reef (AM) http server.
> I agree that allowing user to set port can provide more flexibility, but
> with flexibility also comes some uncertainty - since we cannot guarantee
> that the port specified by the user can be used, as another application may
> already be using that. In fact, on a multi-tenant cluster where multiple
> Reef applications are running, port-collision is inevitable. I guess we can
> still do it and make it clear to the user that REEF can only bind the port
> on a best-effort basis. I am open to that discussion :)
> -Yingda
> On Wed, Oct 8, 2014 at 3:21 AM, Yunseong Lee <> wrote:
> > Hi, I am building an application using Reef-webserver and I have a
> > question.
> >
> > Is there a way to set a port number other than the default value(8080)?
> >
> > As far as I have found, HttpServer does not have a method to set the port
> > number.
> > I found some tests binding PortNumber via Configuration, but since
> > PortNumber is not a public class
> > it is not available outside the package.
> >
> > In my opinion, it is reasonable to allow user to set the port number.
> > When another application reserved 8080 port, I found the app and
> > reef-webserver both go wrong.
> >
> > Any thoughts?
> >
> > Thank you.
> > - Yunseong

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