A single shard is much simpler conceptually and also cheaper to query. I would say that even your 1.2M collection can be a single shard. I'm running a single shard setup 4X that size. You can still have replicas of this shard for redundancy / availability purposes.
I'm not an expert, but I think one of the deciding factors is if your index can fit into RAM (not JVM Heap, but OS cache). What are the sizes of your indexes? On 14 March 2018 at 11:01, Scott Prentice <s...@leximation.com> wrote: > We're in the process of moving from 12 single-core collections (non-cloud > Solr) on 3 VMs to a SolrCloud setup. Our collections aren't huge, ranging > in size from 50K to 150K documents with one at 1.2M docs. Our max query > frequency is rather low .. probably no more than 10-20/min. We do update > frequently, maybe 10-100 documents every 10 mins. > > Our prototype setup is using 3 VMs (4 core, 16GB RAM each), and we've got > each collection split into 2 shards with 3 replicas (one per VM). Also, > Zookeeper is running on each VM. I understand that it's best to have each > ZK server on a separate machine, but hoping this will work for now. > > This all seemed like a good place to start, but after reading lots of > articles and posts, I'm thinking that maybe our smaller collections (under > 100K docs) should just be one shard each, and maybe the 1.2M collection > should be more like 6 shards. How do you decide how many shards is right? > > Also, our current live system is separated into dev/stage/prod tiers, not, > all of these tiers are together on each of the cloud VMs. This bothers some > people, thinking that it may make our production environment less stable. I > know that in an ideal world, we'd have them all on separate systems, but > with the replication, it seems like we're going to make the overall system > more stable. Is this a correct understanding? > > I'm just wondering anyone has opinions on whether we're going in a > reasonable direction or not. Are there any articles that discuss these > initial sizing/scoping issues? > > Thanks! > ...scott > > >
