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From "Andrzej Bialecki (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-13427) Support simulating the execution of autoscaling suggestion
Date Thu, 25 Apr 2019 08:02:00 GMT
Andrzej Bialecki  created SOLR-13427:
----------------------------------------

             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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