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From "Andrzej Bialecki (JIRA)" <>
Subject [jira] [Created] (SOLR-11285) Support simulations at scale in the autoscaling framework
Date Thu, 24 Aug 2017 13:08:00 GMT
Andrzej Bialecki  created SOLR-11285:

             Summary: Support simulations at scale in the autoscaling framework
                 Key: SOLR-11285
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: AutoScaling
            Reporter: Andrzej Bialecki 
            Assignee: Andrzej Bialecki 

This is a spike to investigate how difficult it would be to modify the autoscaling framework
so that it's possible to run simulated large-scale experiments and test its dynamic behavior
without actually spinning up a large cluster.
Currently many components rely heavily on actual Solr, ZK and behavior of ZK watches, or insist
on making actual HTTP calls. Notable exception is the core Policy framework where most of
the ZK / Solr details are abstracted.
As the algorithms for autoscaling that we implement become more and more complex the ability
to effectively run multiple large simulations will be crucial - it's very easy to unknowingly
introduce catastrophic instabilities that don't manifest themselves in regular unit tests.

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