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

["Noble Paul (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-11669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Noble Paul updated SOLR-11669:
------------------------------
    Issue Type: Improvement  (was: Bug)

> 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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