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IVOA Grid & Web Services: VOSpace

Contents

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Overview

Users want to be able to easily publish and share their own data as well as have data reside close to computation nodes when large-scale processing or dynamic caches for intermediate data products in workflows are involved. Three modes of data transfer need to be supported: client-server (the client pushes data to, or pulls data from, the server), server-client (the server pushes data to, or pulls data from, the client) and server-server (one server pushes data to, or pulls data from, another server in response to a client request) also known as third-party transfer.

There are many solutions already to these problems so instead of inventing our own we specify a lightweight interface, VOSpace, that sits on top of existing storage solutions, providing a common interface to an underlying heterogeneity of implementations from local file systems to bulk data grids. VOSpace can distinguish between unstructured data, which is just a collection of bytes, and structured data where there is knowledge about how the bytes are arranged and so additional operations are possible. Individual VOSpace instances can also be federated into a peer network so that the user just interacts with a single data space.

VOSpace 1.x specifications relate to a SOAP-based web service.

VOSpace 1.0

VOSpace 1.0 defines an unconnected flat file space and is now an IVOA Recommendation:

Specification

• Service specification
• WSDL for 1.0 service
• Schema for 1.0 service
• VOSpace usage note v0.1

VOSpace 1.1

VOSpace 1.1 extends the existing 1.0 specification to support containers, links between individual VOSpace instances, third party APIs and a "find" mechanism.

Specification

• Service specification
• WSDL for 1.1 service
• Schema for 1.1 service

Discussion

• Discussion page for 1.1 specification
• Discussion page for property registration
• Discussion page for data formats

History

• Old discussion page for VOSpace 1.1 features

VOSpace 2.0

VOSpace 2.0 defines a RESTful interface.

Specification

Nothing ready quite yet.

Discussion

• Discussion page for specification

Implementations

group	version	endpoint	VOSpace root	Notes
Caltech	v1.1	testnvo.cacr.caltech.edu	vos://nvo.caltech!vospace/	HTTP transports, supports structured nodes and archive formats (tar, tar.gz)
ESO	v1.0	vops1.hq.eso.org	vos://org.eso!vospacetest/	HTTP transports
Astrogrid

Mailing list

The mailing list for discussion of the VOSpace specifications and related issues is: vospace@ivoa.net which is archived at: http://ivoa.net/forum/vospace/index.htm

VOSpace 1.0 history

Discussion

• Discussion page for property registration
• Resource schema (old version)
• Example document (old version)

The discussion pages that lead up to the V1.0 working draft are available here :

• Discussion page for the WSDL and XML schema (closed)
• Discussion page for specification (closed)
• Mailing list archive