There's no one right answer here. I've also seen a hybrid approach where there are multiple collections each of which has some number of tenants resident. Eventually, you need to think of some kind of partitioning, my rough number of documents for a single core is 50M (NOTE: I've seen between 10M and 300M docs fit in a core).
All that said, you may also be interested in the "transient cores" option, see: https://cwiki.apache.org/confluence/display/solr/Defining+core.properties and the transient and transientCacheSize (this latter in solr.xml). Note that this is stand-alone only so you can't move that concept to SolrCloud if you eventually go there. Best, Erick On Fri, Aug 26, 2016 at 12:13 PM, Chamil Jeewantha <kdcha...@gmail.com> wrote: > Dear Solr Members, > > We are using SolrCloud as the search provider of a multi-tenant cloud based > application. We have one schema for all the tenants. The indexes will have > large number(millions) of documents. > > As of our research, we have two options, > > - One large collection for all the tenants and use Composite-ID routing > - Collection per tenant > > The below mail says, > > > https://mail-archives.apache.org/mod_mbox/lucene-solr-user/201403.mbox/%3c5324cd4b.2020...@protulae.com%3E > > SolrCloud is *more scalable in terms of index size*. Plus you get > redundancy which can't be underestimated in a hosted solution. > > > AND > > The issue is management. 1000s of cores/collections require a level of > automation. On the other hand, having a single core/collection means if > you make one change to the schema or solrconfig, it affects everyone. > > > Based on the above facts we think One large collection will be the way to > go. > > Questions: > > 1. Is that the right way to go? > 2. Will it be a hassle when we need to do reindexing? > 3. What is the chance of entire collection crash? (in that case all > tenants will be affected and reindexing will be painful. > > Thank you in advance for your kind opinion. > > Best Regards, > Chamil > > -- > http://kavimalla.blgospot.com > http://kdchamil.blogspot.com
