[occi-wg] Pagination

[Peter Tröger]

Hi,

I would like to underline the importance of pagination. It is one of the pre-conditions for finalizing the DRMAA-OCCI work. You cannot deal with 10.000 job resources over HTTP without pagination support …

Best regards,
Peter.


Am 02.10.2012 um 20:54 schrieb Ralf Nyren <ralf at nyren.net>:

> Hi,
> 
> Pagination [1] is currently not defined in the HTTP Rendering. The hope is to remedy this in a future version combined with the work to separate the OCCI Rendering concept into "transport protocol" and "data format".
> 
> Since pagination is a protocol feature rather than a data format issue it was concluded during today's confcall that future pagination support in OCCI should only affect the transport protocol (if possible). I.e. a data format, such as JSON, should not contain any pagination information.
> 
> How to implement this over HTTP then? And we do not want any custom HTTP headers...
> 
> Proposal
> -------------
> 
> A client must (if desired) request pagination by use of _query_parameters_ in the HTTP URL.
> 
> To solve the issue where a server need to enforce pagination when not requested by the client Florian made an interesting proposal.
> 
> Let us say an OCCI system has 1000000 Compute instances. An OCCI client asking for the full collection (no pagination in the request) must be forced to use pagination because the server cannot send back all instances of the collection.
> 
> The server would then return HTTP status code 301 (redirect) with a URL containing the proper pagination parameters the server would have wished the client had used in the first place.
> 
> Example
> ------------
> 
> < GET /compute/ HTTP/1.0
> 
>> HTTP/1.0 301 Moved Permanently
>> Location: /compute/?id=urn:uuid:f3ec2e3a-0cc1-11e2-91ed-abf19593d6e2&start=0&end=100
> 
> < GET /compute/?id=urn:uuid:f3ec2e3a-0cc1-11e2-91ed-abf19593d6e2&start=0&end=100
> 
>> HTTP/1.0 200
> ...
> 
> By looking at the query parameters the client would see what pagination the server has enforced.
> 
> regards, Ralf
> 
> [1] http://en.wikipedia.org/wiki/Pagination
> _______________________________________________
> occi-wg mailing list
> occi-wg at ogf.org
> https://www.ogf.org/mailman/listinfo/occi-wg

-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 4343 bytes
Desc: not available
URL: <http://www.ogf.org/pipermail/occi-wg/attachments/20121017/5de650dc/attachment.bin>