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From S G <>
Subject Limiting the number of queries/updates to Solr
Date Thu, 03 Aug 2017 02:41:00 GMT

My team provides Solr clusters to several other teams in my company.
We get peak-requirements for query-rate and update-rate from our customers
and load-test the cluster based on the same.
This helps us arrive at a cluster suitable for a given peak load.

Problem is that peak load estimates are just estimates.
It would be nice to enforce them from Solr side such that if a rate higher
than that is seen at any core, the core will automatically begin to reject
the requests.
Such a feature would contribute to cluster stability while making sure the
customer gets an exception to remind them of a slower rate.

A configuration like the following in managed-schema or solrconfig.xml
would be great:
  <select maxPerSec = 1000/>
  <update maxPerSec = 500/>
  <facets maxPerSec = 100/>
  <pivots maxPerSec = 30/>

If the rate exceeds the above limits, an exception like the following
should be thrown: "Cannot process more than 500 updates/second. Please slow
down or raise the coreRateLimiter.update limits in solrconfig.xml'

a step in that direction?


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