Hi Fernando, I did not look at code and not sure if there is special handling in case of a single shard collection, but Solr does not have to choose local shard to query. It assumes that one node will receive all requests and that it needs to balance. What you can do is add preferLocalShards=true to make sure local shards are queried.
HTH, Emir -- Monitoring - Log Management - Alerting - Anomaly Detection Solr & Elasticsearch Consulting Support Training - http://sematext.com/ > On 25 Oct 2018, at 16:18, Fernando Otero <fernando.ot...@olx.com> wrote: > > Hey Shawn > Thanks for your answer!. I changed the config to 1 shard with 7 > replicas but I still see communication between nodes, is that expected? > Each node has 1 shard so it should have all the data needed to compute, I > don't get why I'm seeing communication between them. > > Thanks > > On Tue, Oct 23, 2018 at 2:21 PM Shawn Heisey <apa...@elyograg.org> wrote: > >> On 10/23/2018 9:31 AM, Fernando Otero wrote: >>> Hey all >>> I'm running some tests on Solr cloud (10 nodes, 3 shards, 3 >> replicas), >>> when I run the queries I end up seeing 7x traffic ( requests / minute) >> in >>> Newrelic. >>> >>> Could it be that the internal communication between nodes is done through >>> HTTP and newrelic counts those calls? >> >> The inter-node communication is indeed done over HTTP, using the same >> handlers that clients use, and if you have something watching Solr's >> statistics or watching Jetty's counters, one of the counters will go up >> when an inter-node request happens. >> >> With 3 shards, one request coming in will generate as many as six >> additional requests -- one request to a replica for each shard, and then >> another request to each shard that has matches for the query, to >> retrieve the documents that will be in the response. The node that >> received the initial request will compile the results from all the >> shards and send them back in response to the original request. >> Nutshell: One request from a client expands. With three shards, that >> will be four to seven requests total. If you have 10 shards, it will be >> between 11 and 21 total requests. >> >> Thanks, >> Shawn >> >> > > -- > > Fernando Otero > > Sr Engineering Manager, Panamera > > Buenos Aires - Argentina > > Mobile: +54 911 67697108 > > Email: fernando.ot...@olx.com
