Ah, I missed "single shard" ... this looks relevant: https://issues.apache.org/jira/browse/SOLR-12217
On Wed, Mar 10, 2021 at 12:43 PM Jan Høydahl <jan....@cominvent.com> wrote: > We have not set any shard.preference, and I also think preferLocal > defaults to false, i.e random > > Earlier we had 2 shares for the same collection (both existed on both > nodes) and then requests were distributed to both nodes. That’s why, when > we went to 1 shard, I was wondering if the “single-shard” code path perhaps > never attempts to utilize replicas?? But have not looked in code yet. > > Guess next step is to setup a small local test cluster and see what > happens. > > Jan Høydahl > > > 10. mar. 2021 kl. 15:46 skrev Michael Gibney <mich...@michaelgibney.net > >: > > > > You say not "anything fancy" -- depending on how you define "fancy", if > you > > have an explicit `shards.preference` param, based on the version you're > > running (8.4) you might also take a look at > > https://issues.apache.org/jira/browse/SOLR-14471. (If SOLR-14471 is the > > problem, removing the explicit `shards.preference` param should restore > > default "shuffling" routing). > > > > I haven't dug too deep, but it looks like for 8.4 preferLocalShards > > actually defaults to false? I might be missing something though: > > > https://github.com/apache/lucene-solr/blob/releases/lucene-solr/8.4.1/solr/solrj/src/java/org/apache/solr/client/solrj/routing/RequestReplicaListTransformerGenerator.java#L85 > > > > > > > >> On Wed, Mar 10, 2021 at 9:10 AM Houston Putman <houstonput...@gmail.com > > > >> wrote: > >> > >> I could be wrong, but i dont think preferLocalShards is the default in > >> multi-shard use cases. > >> > >>> On Wed, Mar 10, 2021 at 9:07 AM Mike Drob <md...@mdrob.com> wrote: > >>> > >>> I believe a server will always try to prefer local cores. Can you do an > >>> experiment with 3 nodes, and send http queries to the node not hosting > >> any > >>> replicas? That should confirm the balanced distribution. > >>> > >>> If you have multiple shards, the receiving server will forward the > >> requests > >>> for shards it doesn’t have, but would still prefer local shards when > they > >>> are available. > >>> > >>> On Wed, Mar 10, 2021 at 8:00 AM Jan Høydahl <jan....@cominvent.com> > >> wrote: > >>> > >>>> Hi, > >>>> > >>>> A client has a SolrCloud 8.4 setup with two nodes, and one collection > >>> with > >>>> one shard and replicationFactor=2. > >>>> Of course we want search traffic to be evenly distributed between the > >> two > >>>> replicas. > >>>> The client is using plain HTTP requests, no SolrJ or anything fancy, > >> and > >>>> sends all requests to one of the two nodes. > >>>> I was expecting Solr to forward about 50% of those requests to the > >> other > >>>> replica, but it is serving them all locally. > >>>> > >>>> I know we can setup an LB in front or re-program the client to do > round > >>>> robin, but that is not my question. > >>>> Is the select-random-replica logic only active when we have a sharded > >>>> oollection, and not for a single-shard? > >>>> > >>>> Jan > >>> > >> >
