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 > > >
