Same query delivers different results when refreshed

[liowalter]

The empty query or the "new acquisitions" lists deliver different results when reloaded :

• https://www.swissbib.ch/Search/Results?lookfor=&type=AllFields
• https://baselbern.swissbib.ch/Search/Results?sort=publishDateSort+desc&join=AND&lng=de&bool0%5B%5D=AND&lookfor0%5B%5D=nelB5911910&type0%5B%5D=wnel

For such queries, a lot of records have the same score. My assumption is that the first results in the list come from the first core that has answered. I could count 4 different orders for BB and 6 for green which tends to prove this (now we have both clusters productive).

Possible solutions :

• add some arbitrary parameters to the ranking (for example based on record id) to avoid having two documents with the same score
• it might be possible to configure solr a bit differently to avoid such cases

@guenterh : any idea ?

This needs to be investigated a bit futher.