[SERVER-41472] Create a workload to demonstrate the MongoDB usage difficulties of the WT WT_STAT_CONN_CACHE_LOOKASIDE_SCORE stat Created: 03/Jun/19  Updated: 06/Dec/22  Resolved: 05/Jun/19

Status: Closed
Project: Core Server
Component/s: Storage
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Major - P3
Reporter: Dianna Hohensee (Inactive) Assignee: Backlog - Storage Execution Team
Resolution: Duplicate Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Duplicate
duplicates WT-4842 Enhance lookaside score calculation Closed
Related
related to SERVER-40685 Mongos often fails transactions that ... Closed
related to SERVER-36956 Replace the statistic that dynamicall... Closed
Assigned Teams:
Storage Execution
Participants:

 Description   

The WT_STAT_CONN_CACHE_LOOKASIDE_SCORE stat does not work well as a means for MongoDB to recognize cache pressure in the WT layer because it does not move like we need it to do.

In SERVER-36956 we replaced WT_STAT_CONN_CACHE_LOOKASIDE_SCORE with the WT_STAT_CONN_CACHE_LOOKASIDE_INSERT stat. This is because we saw problems noted in SERVER-40685, where the lookaside score can remain high even after cache pressure goes down.

The goal of this ticket is to create a workload to give to WT to demonstrate the problem so that they can fix it and confirm the problem is resolved.


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