[Drbd-dev] UDP multicast transport

[Drbd-dev] UDP multicast transport

[raulhp]

Hello,

I´m reading the ROADMAP about the DRBD-9.0's features and I see that 
you are developing a transport layer for UDP multicast for the next 
release.

Is there any way to contact someone?

I´m interested in the topic.

Regards!

Re: [Drbd-dev] UDP multicast transport

[Lars Ellenberg]

On Thu, Nov 07, 2013 at 01:32:04PM +0100, raulhp wrote:
> Hello,

Hi there.

> I´m reading the ROADMAP about the DRBD-9.0's features and I see that
> you are developing a transport layer for UDP multicast for the next
> release.

It is on the Roadmap, yes.
It is not current being actively worked on, though.

> Is there any way to contact someone?
> 
> I´m interested in the topic.

You are interested in the topic as in
you desperately would like to use it and might be sponsoring development?

Or, given your UGR email address, as in you are volunteering to help out
with development?

Or as in, if that protocol existed today, you'd like to compare it with
others in some more or less scientific review paper?

Or something else?

Thanks for asking, anyways...

Cheers,

	Lars

-- 
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.

Re: [Drbd-dev] UDP multicast transport

[Philipp Reisner]

> Hi there,
> 
> Yes, I´m interested in making multicast protocol development, then I
> will study and define an algorithm.
> 
> What I can do?
> 
> Raúl

Hi Raúl,

We welcome such a contribution very much. We will help you
in the progress in answering questions and giving pointers.

But let me give you a warning as well:
 The DRBD code is complex, and kernel programming and debugging
 is hard. Plan for several month of your full attention for this task.
 If that is fine for you please read on.

* You need to base your work on the current drbd-9.0 development
  code.

* In case you are not used to GIT, make yourself familiar with this
  great tool. Understand what "rebase" means.

* Make yourself familiar with the DRBD code, make yourself familiar
  with using drbd-9.0 (deploy it in a least 3 virtual machines)

Then you may either do a 
 a (prove of concept) first step, you may introduce UDP support
 as a new address family into the userland tools (drbdadm, drbdsetup).
 [Strictly speaking UDP is not a difference address family but a different
 socket type]

 Get that to work in a network without packet loss.

 Develop ideas of how to deal with packet loss...

 Last step: Actually do multicasting for sending data packets.

or have some completely other approach

You will actually need to keep your work in a dedicated branch that you
will need to rebase on the drbd-9.0 branch from time to time.

In case you work turns into something useful, we might be in the
position to merge your branch mid 2014.

Does this give you an idea?

PS: May I ask about your motivation for this effort?

Best,
 Phil

Re: [Drbd-dev] UDP multicast transport

[Philipp Reisner]

Hi Raul,

I recommend to keep the communication on drbd-dev. Via the
mailing list you can reach all in drbd interested developers.

I do not have more to add right now. Do not hesitate to ask
questions.

Best,
 Phil

> Hi Phil,
> 
> I'm grateful and agree the work to develop.
> 
> I'm currently reviewing the code of version 9.
> 
> I have idea how to implement multicast, and even more with the
> explanation you have given me about this.
> 
> Well, I will continue reviewing the source code to fully understand the
> current implementation of DRBD's communications.
> 
> If there is additional information that you send to me, I appreciate
> it.
> 
> Anything you want to say?
> 
> Regards,
> Raúl
>