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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