There weren't any particular problems we ran into since the client that makes the queries to multiple collections previously would query multiple cores using the 'shards' parameter before we moved to solrcloud. We didn't have any complicated sorting or scoring requirements fortunately.
The one thing I remember looking into was what solr would do when two documents with the same id were found in both collections. I believe it just non-deterministically picked one, probably the one that came in first or last. Depending on how many collections you need to query simultaneously, it's worth looking into using aliases for lists of collections as Alex mentioned. Unfortunately, in our use case, it wasn't worth the headache of managing aliases for every possible combination of collections that needed to be queried, but we would have preferred to use aliases. On Mon, Oct 22, 2018 at 2:27 PM Rohan Kasat <rohan.ka...@gmail.com> wrote: > Thanks Alex. > I check aliases but dint focused much , will try to relate more to my use > case and have a look again at the same. > I guess the specification of collection in the query should be useful. > > Regards, > Rohan Kasat > > On Mon, Oct 22, 2018 at 11:21 AM Alexandre Rafalovitch <arafa...@gmail.com > > > wrote: > > > Have you tried using aliases: > > > > > http://lucene.apache.org/solr/guide/7_5/collections-api.html#collections-api > > > > You can also - I think - specify a collection of shards/collections > > directly in the query, but there may be side edge-cases with that (not > > sure). > > > > Regards, > > Alex. > > On Mon, 22 Oct 2018 at 13:49, Rohan Kasat <rohan.ka...@gmail.com> wrote: > > > > > > Hi All , > > > > > > I have a SolrCloud setup with multiple collections. > > > I have created say - two collections here as the data source for the > > both > > > collections are different and hence wanted to store them differently. > > > There is a use case , where i need to query both the collections and > show > > > unified search results. > > > The fields in the schema are same. ( say - title , description , date ) > > > Is there any specific way i can do this directly with the collections > API > > > or something like that? > > > Or i need to write a federator and combine results from search to the > > > respective collections and then unify them? > > > > > > -- > > > > > > *Regards,Rohan* > > > > > -- > > *Regards,Rohan Kasat* >
