Nice, - thanks. I'll go ahead and close the ticket as done.

This is is now working:

Sounds good

I had a really helpful conversation with this morning. In summary:

• mod-source-record-storage does not support searching with CQL, so we can't just use the same CQL query to both mod-inventory and the SRS store (or indeed bypass mod-inventory).

• But it does have an endpoint (https://github.com/folio-org/mod-source-record-storage/blob/master/ramls/source-record-storage-source-records.raml#L109) where you can POST a list of instance IDs to get back a batch of the corresponding MARC records.

• The documentation for this is a bit sparse, but the key points William filled in are:

  • The thing you post should be a JSON array of the IDs you want (e.g. ['123', '456']).

  • You need to specify `idType=INSTANCE` to force the interpretation of the IDs as instance IDs rather than the IDs of the SRS records themselves.

What this means is that we can write the Z39.50 server's retrieval software to fetch batches of (say) 20 instance records at a time from mod-inventory, then POST the IDs extracted from those records all at once to get the MARC records that we're going to return. This means we only need to make twice as many round-trips to obtain all the records as we would just to get instances, rather than 21 times as many.

Hi - here link to the notes: https://docs.google.com/document/d/1DPIbsmKjOlPL4L5UQF4Hv49lLLXv3O5PSbRzAZAqq9c/edit

You can do any search in Inventory - use the search options, the filters or Query Search and the get the list of Instance UUID: