Thanks Shawn for the update. I am going ahead with the standard aliases approach , suits my use case.
Regards, Rohan Kasat On Mon, Oct 22, 2018 at 4:49 PM Shawn Heisey <apa...@elyograg.org> wrote: > On 10/22/2018 1:26 PM, Chris Ulicny wrote: > > 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. > > Yes, that is how it works. I do not know whether it is the first one to > respond or the last one to respond that ends up in the results. Solr is > designed to work with data where the uniqueKey field really is unique > across everything that is being queried. Results can vary when you have > the same uniqueKey value in more than one place and you query both of > them at once. > > > 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. > > Aliases are the cleanest option. This syntax also works, sorta blew my > mind when somebody told me about it: > > http://host:port/solr/current,archive2,archive4/select?q=*:* > > If you're using a Solr client library, it might not be possible to > control the URL like that, but if you're building URLs yourself, you > could use it. > > I recently filed an issue related to alias handling, some unexpected > behavior: > > https://issues.apache.org/jira/browse/SOLR-12849 > > Thanks, > Shawn > > -- *Regards,Rohan Kasat*
