perfsonar development work

[Nicolas Simar <>]

Hi Nina,

at the end of the Zagreb meeting, the idea was launched to have a global 
LS (awaiting for the dLS). Several groups of users have been complaining 
that there isn't any discovery of MAs and they'd like to skip the pSUI 
selection step.

The idea shown on the slide would be that the current LS would be 
transformed to register to a global LS their URL and the list of domains 
they are responsible for.

The general idea would be that a client would go first to the global LS. 
The request would contain the domain name (or AS or list of domain name 
or AS) for which the information is seeked. The gLS would then send back 
the URL of the LS which has registered that information.

The client can then contact the LSes to get the URL of the web-service 
for which they wish to have the data.

We would wish for the June Berlin workshop to have the global LS working 
along with perfSONAR-UI.


In order to investigate for its feasibility, I'd like
- to have your comments on the idea
- to have your thoughts on how perfsonarUI would use the gLS to go from 
a traceroute IP address and find out the web-services that contains the data


Potential Drawback: in the case of the Hades MA, which data spans across 
multiple domain, it wouldn't work (IMHO?) as the search would be done 
based on domain names. But that's not an issue as we got only one Hades 
MA.

Thanks a lot,
Nicolas

-------- Original Message --------
Subject: Global LS deployment until we have dLS
Date: Fri, 11 Apr 2008 12:50:14 +0200 (CEST)
From: Maciej Glowiak 
<>
To: , , 
,        
CC: 


Hi,

According to discussion on Thursday and our talk with Martin I am 
sending the
slide depicting the idea of global LS deployment until the time when we 
have
dLS implemented and deployed.

The idea is to have one common global-LS that would keep summarized 
information
from other Lookup Services.

The summary will be send as LSRegistration Request and will contain:
   1) domain name of services stored in local LS
or (next step?)
   2) first level of summary (all IPs, geografical info and evnetTypes)
   (to be discussed)

For instance on the picture there is PSNC MA that register to LS1. LS1 will
register its summarized information to global LS (well known address).

Client application that wants to get information about PSNC services 
will ask
for LS address for (query 1)
   1) specific domain
   or
   2) IP, geografical location, eventType (if used 1st level summary)

Then the client will be responded with LS1 URL and will perform just
xquery to obtain (query 2) further data.

There might be also replication from gLS to another gLS (backup) - just 
full
database copy.

Best regards
Maciej

--
Nicolas
______________________________________________________________________

Nicolas Simar
Network Engineer

DANTE - www.dante.net

Tel - BE: +32 (0) 4 366 93 49
Tel - UK: +44 (0)1223 371 300
Mobile: +44 (0) 7740 176 883

City House, 126-130 Hills Road
Cambridge CB2 1PQ
UK
_____________________________________________________________________

Attachment: global-LS-idea.ppt
Description: MS-Powerpoint presentation