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https://issues.apache.org/jira/browse/SOLR-11669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Noble Paul resolved SOLR-11669.
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Resolution: Fixed
Fix Version/s: 7.3
> Policy Session lifecycle needs cleanup
> --------------------------------------
>
> Key: SOLR-11669
> URL: https://issues.apache.org/jira/browse/SOLR-11669
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: AutoScaling
> Reporter: Andrzej Bialecki
> Assignee: Noble Paul
> Priority: Major
> Fix For: 7.3
>
>
> {{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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