[DOCS-13686] Investigate changes in SERVER-48529: Delete unused PlanCache::feedback() mechanism Created: 02/Jun/20  Updated: 13/Nov/23  Resolved: 14/Jun/21

Status: Closed
Project: Documentation
Component/s: manual, Server
Affects Version/s: None
Fix Version/s: 4.7.0, 4.4.3, Server_Docs_20231030, Server_Docs_20231106, Server_Docs_20231105, Server_Docs_20231113

Type: Task Priority: Major - P3
Reporter: Backlog - Core Eng Program Management Team Assignee: Andrew Feierabend (Inactive)
Resolution: Works as Designed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Documented
documents SERVER-48529 Delete unused PlanCache::feedback() m... Closed
Participants:
Days since reply: 3 years, 36 weeks, 1 day ago
Epic Link: DOCSP-9747

 Description   

Description

Downstream Change Summary

This patch removes the setParameter internalQueryCacheFeedbacksStored. I think this parameter was pretty obscure and unlikely to be ever explicitly configured, but I'm notifying downstream teams just in case. The parameter does nothing in 4.4 and has been removed in 4.6. Any uses of this in command line parameters or config files should simply be removed.

Description of Linked Ticket

In previous versions, the PlanCache tracked the score associated with a cache entry for several historical executions of the cached plan. These scores were then surfaced via the planCacheListPlans comment, which was deprecated in 4.2 and removed in 4.4. The number of historical executions tracked was controlled by the internalQueryCacheFeedbacksStored setParameter.

Since this information is no longer surfaced by the replacement for planCacheListPlans (the $planCacheStats agg stage), the code for tracking this "feedback" information can be deleted. The internalQueryCacheFeedbacksStored setParameter can also be deleted.

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)


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