[ODATA-317] Allow multiple reads in the same transaction - OASIS Technical Committees Issue Tracker

Details

Type: Improvement
Status: Closed
Priority: Minor
Resolution: Fixed
Affects Version/s: V4.0_CSD01
Fix Version/s: V4.0_CSD02
Component/s: Protocol
Labels:
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Environment:

[Applied]

Proposal:

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Define request header

Expect: odata.isolation=snapshot

On a batch request this means that all requests in the batch are executed with isolation-level snapshot.

For requests returning a collection (whether within a batch or not) this means that next-links return consistent data with the same snapshot.

Trying to follow a next-link referring to a snapshot that is no longer available returns 410 Gone or 404 Not Found.

The odata.isolation preference has no effect on links other than the next-link: navigation links, self-links and edit-links are referring to the "current" version, not to the snapshot.

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Define request header Expect: odata.isolation=snapshot On a batch request this means that all requests in the batch are executed with isolation-level snapshot. For requests returning a collection (whether within a batch or not) this means that next-links return consistent data with the same snapshot. Trying to follow a next-link referring to a snapshot that is no longer available returns 410 Gone or 404 Not Found. The odata.isolation preference has no effect on links other than the next-link: navigation links, self-links and edit-links are referring to the "current" version, not to the snapshot.
Resolution:

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https://www.oasis-open.org/committees/download.php/49613/odata-v4.0-wd02-part1-protocol-2013-06-19.docx
https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/vocabularies/Org.OData.Core.V1.xml?rev=377
https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/vocabularies/Org.OData.Capabilities.V1.xml?rev=379

https://www.oasis-open.org/committees/download.php/49614/odata-v4.0-wd02-part2-url-conventions-2013-06-19.docx
https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/ABNF/odata-abnf-construction-rules.txt?rev=380
https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/ABNF/odata-abnf-testcases.xml?rev=380

https://www.oasis-open.org/committees/download.php/49615/odata-v4.0-wd02-part3-csdl-2013-06-19.docx
https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/schemas/edmx.xsd?rev=357
https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/schemas/edm.xsd?rev=377
https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/schemas/MetadataService.edmx?rev=374

https://www.oasis-open.org/committees/download.php/49611/odata-atom-format-v4.0-wd02-2013-06-19.docx
https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/schemas/metadata.xsd?rev=382

https://www.oasis-open.org/committees/download.php/49612/odata-json-format-v4.0-wd02-2013-06-19.docx

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https://www.oasis-open.org/committees/download.php/49613/odata-v4.0-wd02-part1-protocol-2013-06-19.docx https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/vocabularies/Org.OData.Core.V1.xml?rev=377 https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/vocabularies/Org.OData.Capabilities.V1.xml?rev=379 https://www.oasis-open.org/committees/download.php/49614/odata-v4.0-wd02-part2-url-conventions-2013-06-19.docx https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/ABNF/odata-abnf-construction-rules.txt?rev=380 https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/ABNF/odata-abnf-testcases.xml?rev=380 https://www.oasis-open.org/committees/download.php/49615/odata-v4.0-wd02-part3-csdl-2013-06-19.docx https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/schemas/edmx.xsd?rev=357 https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/schemas/edm.xsd?rev=377 https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/schemas/MetadataService.edmx?rev=374 https://www.oasis-open.org/committees/download.php/49611/odata-atom-format-v4.0-wd02-2013-06-19.docx https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/schemas/metadata.xsd?rev=382 https://www.oasis-open.org/committees/download.php/49612/odata-json-format-v4.0-wd02-2013-06-19.docx

Description

Allow change sets of only read operations. The idea being you can get a snap shot of potentially unrelated entities at an instance in time. It would also be useful for deltas where you want to get all the changes (even for unrelated entities) within a single change set request at a certain point of time.

Allow multiple reads in the same transaction

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