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Bulk operations may be implemented for the purpose of moving a large amount of data at one time without the overhead of individual calls for each resource.
Externally administered test scores (for example, SAT, ACT, or statewide standardized tests) are often received as data files (not individual transactions) and thus will require bulk loading. An online assessment product may not support transactional updates through an Ed-Fi REST API from within their software, and will instead find it necessary to supply a bulk upload of data at regular intervals. Even SIS products that do support transactional updates may still find it useful to do a one-time bulk loading of data when initially connecting to a data store through an API.
Bulk export operations are useful when clients need an efficient way to obtain a large data set from the hosting platform. Export is also useful where clients of the API host need data files to adhere to a particular format (e.g., exchange with another system that is not capable of its own direct exchange with the API host).
Bulk Operation Recommendations
When bulk operations are supported through an Ed-Fi REST API, consider the following guidelines:
- File Management. Bulk operations work on files that can take a non-trivial amount of time to load or, in the case of an export, for the server to generate. A bulk import operation API should allow files to be uploaded incrementally and for file uploads to be resumed.
- Control Protocol. Bulk operations implemented as part of an Ed-Fi REST API should be managed over HTTPS.
- File Transfer. Using HTTPS for file transfer is recommended for consistency with the REST portion of the API as well as with the encryption. Other secure protocols may be used.
- Status. Status information should be available (pulled via GET) or provided (pushed via POST) regarding the progress and results of batch operations.
Bulk Packet Format
While JSON is a common packet format for many web APIs (including the transactional operations of the Ed-Fi ODS API), bulk data transfers between systems are more suited to XML. XML documents have some advantages over JSON documents, foremost among these is the ability to be validated and parsed by native libraries on a variety of platforms. JSON does not include a specification for schema validation.[8] Accordingly, bulk data exchange performed through Ed-Fi REST API operations leverage interchanges built from the Ed-Fi Core XML Schema.
XML documents are considered well formed when they conform to the XML specification, they are considered valid when they can be validated against a specific XML schema, and they are considered correct when the contained information may be correctly interpreted by other systems. For the bulk loading operations of an Ed-Fi REST API, correct implies that applicable references to Resources exist at the conclusion of a bulk load operation.
XML is the recommendedpacket format for the bulk operations of an Ed-Fi REST API. It is further recommended that the Ed-Fi Standard Interchange Schemas be used where appropriate. Where applicable, bulk exports of data should align with bulk loading formats to enable a round trip of information.
8 IETF is working on a JSON Schema specification, see http://json-schema.org/documentation.html Anchor 8 8
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