Andrzej Bialecki  created SOLR-13427:
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             Summary: Support simulating the execution of autoscaling suggestion
                 Key: SOLR-13427
                 URL: https://issues.apache.org/jira/browse/SOLR-13427
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: AutoScaling
            Reporter: Andrzej Bialecki 
            Assignee: Andrzej Bialecki 
             Fix For: master (9.0)


It's not always clear what would be the final state of the cluster after 
applying the suggested changes (obtained from {{/autoscaling/suggestions}}), 
especially on a large and busy cluster where several autoscaling rules have to 
be considered.

This issue proposes to use the simulation framework for simulating the effects 
of the suggestions.

First, the simulator would be initialized from the current state of a real 
cluster. Then it would run several rounds of simulated execution of suggestions 
until there were either no more suggestions (the cluster would be perfectly 
balanced) or the iteration count limit was reached.

This simulation could be executed using either the deployed autoscaling config 
or one provided by the user, which would make it easier to test the effects of 
various configurations on the cluster layout.

Support for this functionality would be integrated into the existing {{SolrCLI 
autoscaling}} tool.



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