[Nmc-wg] Call 6/10 @ 15:00 UTC

[romradz at man.poznan.pl]

Thanks Michael. In general I think it would be perfect if NMC could 
support both approaches of data transfer (streaming and separate 
data channel).

btw. could you write what's the difference between Flow MA (or Flow 
Subscription MA) and Flow Subscription MP. It's not clear to me (the 
picture 
https://wiki.man.poznan.pl/perfsonar-mdm/images/perfsonar-mdm/2/28/JRA1_Netflow_Subscription_MA_-_design_-_v0.1.png 
is confusing).

... and do you have examples of control NMC messages you were using for 
setting up tunnel(s).

Roman


On Wed, 16 Jun 2010, Michael Bischoff wrote:

> Well the old, and really old is still on the wiki:
> https://wiki.man.poznan.pl/perfsonar-mdm/index.php/Flow_Subscription_MP/Implementation_Details
>
> The (over?) simplified rundown is as follows:
>
> ----------------------------------------------------
> On perfsonar layer(control channel):
> Subscribe message( subject(what do you want a stream of) +
> target(setup tunnel to where) ->
> <- key
> ...
> keepalive(with key) ->
> <- ok
> ...
> Unsubscribe ->
> <- clean tear down
> ----------------------------------------------------
> On the transport layer(data channel):
> (pre condition -> subscribe request)
> perfsonar service creates a tunnel to target.
> write data to service end of tunnel
>
> Now an extension upon the NMC-base that would standardize the
> 'persfonar as control channel + data channel' would
> need to ratify a couple of things like tunnel type negotiation(current
> zebadee is simply assumed and used), some
> definition over what protocols are allowed(they should probably be
> 'open') and other things that I can't remember right
> now.
>
> papers describing different implementations(non-perfsonar/nmc) should
> be widely available.
> The short, as most of the papers I've seen also seem to comment, is
> that setting up a separate data channel is
> costly and one needs to be able to justify this cost. Such an approach
> is only useful in cases where you know
> beforehand that there is going to be a lot of data. Other issue is the
> cost of converting data because the data-
> channel can 'speak' anything it wants it doesn't require conversion
> which might be, a big enough safe that it offsets
> the cost of setting up the separate channel. a Perfsonar specific
> advantage is that it allows for smoother transition
> to perfsonar as you can utilize perfsonar to discover services but
> still receive in know format and process it using
> (non-perfsonar) tools that are already available. (this avoids the all
> or nothing barrier)
>
> Where there any specifics you wanted to know?
>
> Best regards,
>
> Michael
>
>
> On Wed, Jun 16, 2010 at 1:18 PM, romradz at man.poznan.pl
> <romradz at man.poznan.pl> wrote:
>>
>> Hi Michael,
>>
>> is there the documentation of control channel approach which was implemented
>> in flow subscription MA?
>>
>> Cheers,
>> Roman
>>
>>
>> On Fri, 11 Jun 2010, Michael Bischoff wrote:
>>
>>> I guess we postponed or something went really wrong..
>>> I've set up a doodle so people can indicate their availability for next
>>> week:
>>> http://doodle.com/m7vh8pd6exbaqf29
>>>
>>> A proposal for streaming in NMC is here:
>>> (mind you in still a work in progress/draft and it hasn't been proof
>>> read/spell checked)
>>> https://docs.google.com/a/controplex.com/View?id=dpn9385_1fmtsx7g9
>>> In it's current form should be good enough for gettign the discussion
>>> started.
>>>
>>> Best regards,
>>>
>>> Michael
>>> On Thu, Jun 10, 2010 at 4:03 PM, Michael Bischoff
>>> <Michael.bischoff at controplex.nl> wrote:
>>>      That is a possibility I suppose, I don't know about the availability
>>> of others.
>>> Who is going to be available as it currently stands?
>>>
>>>
>>> On Thu, Jun 10, 2010 at 3:14 PM, romradz at man.poznan.pl
>>> <romradz at man.poznan.pl> wrote:
>>>
>>>      Hi,
>>>
>>>      it will be very difficult to me to join the meeting today :( Can we
>>> postpone it?
>>>
>>>      Roman
>>>
>>>
>>> On Tue, 8 Jun 2010, Jason Zurawski wrote:
>>>
>>> All;
>>>
>>> There will be an NMC call this thursday at 15:00 UTC.  The meeting will
>>> be run by Michael, and the agenda is to discus altering the protocol to
>>> allow streaming (the response in particular).  The notes and agenda will
>>> be posted here:
>>>
>>>
>>> https://forge.gridforum.org/sf/wiki/do/viewPage/projects.nmc-wg/wiki/20100610Notes
>>>
>>> Thanks;
>>>
>>> -jason
>>> _______________________________________________
>>> Nmc-wg mailing list
>>> Nmc-wg at ogf.org
>>> http://www.ogf.org/mailman/listinfo/nmc-wg
>>>
>>>
>>>
>>>
>>
>