Transcript Powering the Virtual Observatory

talk structure
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who are we ?
what is a VO ?
what are the challenges ?
what is an e-project ?
Andy Lawrence
2002
Garching June
AstroGrid
http://www.astrogrid.org.uk
Belfast
Cambridge
Edinburgh
Jodrell
Leicester
MSSL
RAL
Andy Lawrence
2002
Garching June
AstroGrid
http://www.astrogrid.org.uk
Optical
Infrared
X-ray
Radio
Solar
Space Plasma
Andy Lawrence
Garching June
2002
people
• PL =
• PS
• PM
Andy Lawrence
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Nic Walton
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Tony Linde
slogans
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the archive is the sky (stolen from US-NVO)
everybody can be a power user
shift the results not the data
a supercomputer on your desk
goals
• A working datagrid for key UK databases
– machines, middleware and user interface
• tools for simultaneous browsing
– plus advanced visualisation, links to spectra etc.
• tools for on-line data analysis
– complex queries, statistics, model fitting, cluster analysis etc
• system for uploading code
• resource discovery method
the project
• PPARC funded project Sept 2001-2004
– approx 6Meuro
• Grid technology development programme
– part of UK e-Science programme
– links to GridPP, MyGrid (Bio), OGSA (Globus)
• Stepping stone to Virtual Observatory
– partner in AVO
– working links with US-VO
methodology
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using Unified Process / UML
architecture driven
use case centric
iterative
open project approach
– open collaboration interactive web sites
– code sharing intended
– open source coding under consideration
status
• elaboration phase two-thirds finished
– science problems / use cases / architecture
– technology assessment reports
– collaborative web pages set up
• construction phase begins Sept 2002
• continuing R&D stream
– contribution to AVO
– collaboration with OGSA project
AstroGrid & AVO
• AstroGrid partner in AVO
– subset of work credited as AVO work
• CDS = V0.2
• demos early 2003 = V0.5
• AstroGrid late 2004 = V1
– fully working but functions limited as necessary
• AVO Phase B 2004+ = V2
collectivisation and democratisation
• thirty year trend towards communal organisation
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facility class (common-user) instruments
central development of data reduction s/w
calibrated archives with simple tools
information services (Vizier, ADS, NED)
large consortium projects (MACHO, 2dF, SDSS, UKIDSS, VISTA...)
• next steps
– inter-operable archives (joint queries)
– communal exploration and analysis tools (data mining)
– automated resource discovery (registry)
the Virtual Observatory concept
• Aim to make all archives
speak the same language
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all searchable and analysable by the same tools
all data sources accessible through a uniform interface
all data held in distributed databases that appear as one
archives form the Digital Sky
eventual interface to real observatories
the archive is the sky
the Grid concept
• shared managed distributed resources
– documents + data + software + storage + cycles + expertise
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network : ability to pass messages
web : transparent document system
a supercomputer
computational grid : transparent CPU on your desktop
datagrid : transparent data access and services
information grid, knowledge grid ... ? everybody can
be a power user
Virtual Organisations ?
obstacles to overcome
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sociology
internet technology
i/o bottleneck
network bottleneck
obstacles to overcome (1)
• sociology
– need agreed formats for data, metadata, provenance
– need standardised semantics ("ontology")
• internet technology
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need protocols for publishing and exchanging data
need registry for publishing service availability and semantics
need method of transmitting authentication/authorisation
need methods for managing distributed resources
obstacles to overcome (2)
• i/o bottleneck
– need database supercomputers
– need innovative search and analysis algorithms
• network bottleneck
– data centres must provide analysis service
– facility class analysis code needed
shift the results not the data
grid geometry needed
• not P2P (like Napster)
• not a hierarchy (like LHC grid)
• service providers + users (like most commerce)
– some unplanned open use
– some registered use
– variety of access rights
two rivers
• academic / Globus
– remote log on
– identity/authentication/authorisation
– resource management
• commercial / W3C
– exchange of data (B2B)
– service description and publication
– "Web services" = XML + SOAP + WSDL (cf GLU)
Globus problems
• only half works
• data transfer primitive
– flat files only
• not a services-user structure
Web service problems
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one-to-one
bulky
no general auth/auth solution
no accepted service registry solution
no ontology solution
solutions ?
• Grid Services : OGSA project
– Globus + IBM + more
• Database access : OGSA-DAI project
– UK e-science programme
– MyGrid and AstroGrid = early adopters
• need Astro-registry solution
• need Astro-ontology service (cf UCDs)
• need Astro-QL
e-project
• open, interactive, collaborative web sites
– reading open to all
– registered users can post/edit items
• AstroGrid News
• AstroGrid Forum
• AstroGrid Wiki
– shared documents
– shared code
– collaborative development
FIN
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