I have never heard mention that joins support distributed search, so you
cannot do a join against a sharded core.
However, if from your example, innerCollection was replicated across all
nodes, I would think that should work, because all that comes back from
each server when a distributed search happens is the best 'n' matches,
so exactly how those 'n' matches were located doesn't matter
particularly.
Simpler answer: try it!
Upayavira
On Tue, Jun 25, 2013, at 11:25 PM, Chris Toomey wrote:
> What are the restrictions/limitations w.r.t. joins when using SolrCloud?
>
> Say I have a 3-node cluster and both my "outer" and "inner" collections
> are
> sharded 3 ways across the cluster. Could I do a query such as
> "select?q={!join+from=inner_id+fromIndex=innerCollection+to=outer_id}xx:foo&collection=outerCollection"?
>
> Or if the above isn't supported, would it be if the "inner" collection
> was
> not sharded and was replicated across all 3 nodes, so that it existed in
> its entirety on each node?
>
> thx,
> Chris
