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From shushuai zhu <>
Subject Best practice to support multi-tenant with Solr
Date Fri, 14 Mar 2014 22:10:10 GMT

I am looking into Solr 4.7 for best practice of multi-tenancy support. Our use cases require
support of thousands of tenants (say 10,000) and the incoming data rate could be more than
10k documents per second. I did some research and found people talked about scaling tenants
at all four levels:

Solr Cloud

I am listing them plus some quoted comments from the links.

1) Solr Cloud and Collection

Are you trying to do "multi-tenant"? If so, you should be talking
    "multi-cluster" where you externally manage your "tenants",
    assigning them to clusters, but keeping tenants per cluster down in
    the dozens/hundreds, and "archiving" inactive tenants and spinning
    up (and down) clusters as inactive tenants become active or fall
    into inactivity. But keeping 1,000 or more tenants active in a
    single cluster as separate collections is... a no-go.

2) Shard

Document routing can be used to achieve a more efficient
    multi-tenant environment. This can be done by making the tenant id
    the shard key, which would group all documents from the same tenant
    on the same shard.

3) Core

Every multitenant situation is going to be different, but at the
    extreme a single core per tenant is the cleanest and provides the
    best separation, optimal performance, and supports full tf-idf
    relevancy of document fields for each tenant.

Well, we try to use Solr to run a multi-tenant index/search
    service.  We assigns each client a different core with their own
    config and schema. It would be good for us if we can just let the
    customer to be able to create cores with their own schema and

I also saw slides talking about scaling time along Collection: timed
    collections (slides 50 ~ 58)

According to these, I am thinking about the following approach:

In a single Solr Cloud, the multi-tenant support is at Core level
    (one or more cores per tenant), and for better performance, will
    create a collection every day. When a tenant grows too big, will
    migrate it from this Solr cloud to a new Solr Cloud.

Any potential issue with this approach? Is there better approach
    based on your experience?

A few questions related to proposed approach:

1) When a core is replicated to multiple nodes via multiple shards,
    the query submitted against a particular core (tenant) should be
    executed distributed, right?
2) What is the best way to move a core from one Solr Cloud to
3) If we create one collection per day and want to keep data for
    three years for example, is it OK to have so many collections? If
    yes, is it cheap to maintain the collection alias for easy querying?



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