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Date: Thu, 09 Oct 2014 02:11:30 +0900
From: Yunseong Lee <yunseong.lee@me.com>
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Subject: Re: Question about Reef-webserver
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Thanks for the explanation in detail Yingda, Markus and Julia.
Now I understand why users are not always able to set the port number.

But I still have a question about binding parameter. I already tried to b=
ind a port number as you suggested:

=C2=A0 final Configuration httpServerConfiguration =3D Tang.=46actory.get=
Tang().newConfigurationBuilder()=C2=A0
=C2=A0 .bindNamedParameter(PortNumber.class, =229000=22)=C2=A0
=C2=A0 .build();=C2=A0

However, since PortNumber is not a public class, it is not available to u=
se in my class so that I could not bind the parameter.
Would you please let me know if I missed some point=3F

Thank you.
- Yunseong


I tried the way Julia suggested, but PortNumber is not a public class,=C2=
=A0

On October 9, 2014 at 1:07:01 AM, Markus Weimer (weimer=40apache.org) wro=
te:

Hi, =20

mostly: What Yingda said. =20

Typically, we are on clusters with shared machines where one physical =20
machine (and IP address) hosts multiple containers. Assuming that any one=
 =20
particular port is available for us isn't possible. Hence, the constructo=
r =20
of HttpServerImpl tries different ports until an available one is found. =
In =20
the case of the Driver, we use the found port in order to register the =20
application with the resource manager to enable discovery through the RM,=
 =20
which is part of the infrastructure of the cluster and therefore a known =
=20
entity. =20


The way HttpServerImpl does this searchfor a port is configurable, but it=
 =20
starts with com.microsoft.reef.webserver.PortNumber, which defaults =20
to 8080. If you want to start the search elsewhere, you can bind a =20
different value to that named parameter. =20

Hope this helps, =20

Markus =20

On Wed, Oct 8, 2014 at 7:15 AM, Yingda Chen <ydchen=40gmail.com> wrote: =20

> We had similar discussions before, and for most usage cases, we depend =
on =20
> YARN to do the http traffic forwarding, which will automatically find t=
he =20
> port used by Reef (AM) http server. =20
> =20
> I agree that allowing user to set port can provide more flexibility, bu=
t =20
> with flexibility also comes some uncertainty - since we cannot guarante=
e =20
> that the port specified by the user can be used, as another application=
 may =20
> already be using that. In fact, on a multi-tenant cluster where multipl=
e =20
> Reef applications are running, port-collision is inevitable. I guess we=
 can =20
> still do it and make it clear to the user that REE=46 can only bind the=
 port =20
> on a best-effort basis. I am open to that discussion :) =20
> =20
> -Yingda =20
> =20
> On Wed, Oct 8, 2014 at 3:21 AM, Yunseong Lee <yunseong.lee=40me.com> wr=
ote: =20
> =20
> > Hi, I am building an application using Reef-webserver and I have a =20
> > question. =20
> > =20
> > Is there a way to set a port number other than the default value(8080=
)=3F =20
> > =20
> > As far as I have found, HttpServer does not have a method to set the =
port =20
> > number. =20
> > I found some tests binding PortNumber via Configuration, but since =20
> > PortNumber is not a public class =20
> > it is not available outside the package. =20
> > =20
> > In my opinion, it is reasonable to allow user to set the port number.=
 =20
> > When another application reserved 8080 port, I found the app and =20
> > reef-webserver both go wrong. =20
> > =20
> > Any thoughts=3F =20
> > =20
> > Thank you. =20
> > - Yunseong =20
> =20

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