[jira] [Created] (SOLR-11669) Policy Session lifecycle needs cleanup

["Andrzej Bialecki (JIRA)" <ji...@apache.org>]

Andrzej Bialecki  created SOLR-11669:
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             Summary: Policy Session lifecycle needs cleanup
                 Key: SOLR-11669
                 URL: https://issues.apache.org/jira/browse/SOLR-11669
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: AutoScaling
            Reporter: Andrzej Bialecki 
            Assignee: Noble Paul


{{Policy.Session}} is used in several places in the autoscaling framework. However, its life-cycle is unclear and inconsistent - in some places ({{ComputePlanAction}}) sessions are created directly via {{Policy.createSession}}, in other places a thread-local caching in {{PolicyHelper}} is used, in still other places the {{ObjectCache}} is used.

{{Session}} creates a copy of live nodes on instantiation, which may become stale, but {{PolicyHelper}} caching never checks whether this instance is still valid while it's still in cache.

Also, refcounting leads to awkward and non-intuitive code, such AddReplicaCmd:103.



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