Comments (2)
Hi,
Thank you very much for your prompt and thorough response. Your solution solved my issue, and I truly appreciate your help!
Best regards,
Paloma
from snowstorm.
The Snowstorm native API that you are using does not allow pagination beyond 10,000 results when using the offset
parameter. However it does allow unlimited pagination via the searchAfter
parameter. We have this parameter as a workaround for a restriction in Elasticsearch. Elasticsearch that is not able to paginate using offset without reading all the results from previous pages into memory and that gives poor performance.
To paginate using searchAfter:
- request the first page of results in the normal way, setting the limit parameter as required to specify the page size
- take the searchAfter string from the end of the first page and set it as a request parameter to load the subsequent page
For example the first three pages from the Jan 2024 International Release could be loaded like this:
- https://browser.ihtsdotools.org/snowstorm/snomed-ct/MAIN/2024-01-01/concepts?activeFilter=true&limit=5
- https://browser.ihtsdotools.org/snowstorm/snomed-ct/MAIN/2024-01-01/concepts?activeFilter=true&limit=5&searchAfter=WyI5OTk0ODA1NjEwMDAwODcxMDAiXQ==
- https://browser.ihtsdotools.org/snowstorm/snomed-ct/MAIN/2024-01-01/concepts?activeFilter=true&limit=5&searchAfter=WyI5OTkxMDA4Il0=
The allowUnlimitedConceptPagination
parameter you mentioned only blocks the /browser/{branch}/concepts
endpoint. This is disabled by default to prevent anyone extracting the complete set of concept definitions from the public browser.
from snowstorm.
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from snowstorm.