Hi list! I am running a multi-tenant system where the tenants can upload and import their own data into their respective cores. Fortunately, Solr makes it easy to make sure that the search indices don't mix and that clients can only access their "cores".
However, isolating the resource consumption seems a little trickier. Of course it's fairly easy to limit the number of documents and queries per second for each tenant, but what if they add a few GBs of text to their documents? What if they use millions of different filter values? This may quickly fill up the VM heap and negatively impact the other tenants (I'm totally fine if the search for that one tenant goes down). Of course I can check their input data and apply a seemingly endless number of limits for all kinds of cases but that smells. Is there a more general solution to limit resource consumption per core? Something along the lines of "each core may use up to 5% of the heap". One suggestion I found on the mailing list was to run a separate Solr instance for each tenant. While this is certainly possible there is a significant administrative and resource overhead. Another way may be to go full on SolrCloud and add shards and replicas as required, but I have to limit the resources I can use. Thanks! Georg
