Andrzej Bialecki  created SOLR-13155:

             Summary: CLI tool for testing autoscaling suggestions against a 
live cluster
                 Key: SOLR-13155
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: AutoScaling
            Reporter: Andrzej Bialecki 
            Assignee: Andrzej Bialecki 
             Fix For: 8.0, master (9.0)

Solr already provides /autoscaling/diagnostics and /autoscaling/suggestions 
endpoints. In some situations it would be very helpful to be able to run "what 
if" scenarios using data about nodes and replicas taken from a production 
cluster but with a different autoscaling policy than the one that is deployed, 
without also worrying that the calculations would negatively impact a 
production cluster's Overseer leader.

All necessary classes (including the Policy engine) are self-contained in the 
SolrJ component, so it's just a matter of packaging and writing a CLI tool + a 
wrapper script.

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