: Ah, I missed "single shard" ... this looks relevant: : https://issues.apache.org/jira/browse/SOLR-12217
That improvement still isn't going to impact Jan's situation where the *client* isn't SolrJ ... as the description says: >> NOTE: This Jira doesn't cover the single-sharded collections cases when >> not using the CloudSolrClient or Streaming Expressions (i.e. if you do >> a non-streaming curl request to a random node in the cluster, the >> shards.preference parameter is not considered in the case of single >> shards collections). : : 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 : > >>> : > >> : > : -Hoss http://www.lucidworks.com/
