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Type: Task
Resolution: Fixed
Priority: Major - P3
Fix Version/s: 9.0.0-rc0
Affects Version/s: None
Component/s: None
Labels:
- unbounded-cursor-memory-usage

Assigned Teams:

Query Execution
Backwards Compatibility:
Fully Compatible
Sprint:
QE 2026-04-27
CAR Domain/s:
None

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name(s):
None
Goal Link:
None

To improve memory efficiency, the CountScan component should replace its use of stdx::unordered_set for tracking duplicate records with RecordIdDeduplicator. This change is recommended because RecordIdDeduplicator internally utilizes a Roaring bitmap, which is a more memory-efficient approach.

has to be done before

SERVER-122279 Add knob in Classic NearStage, UpdateStage and CountScan to fail query if record id deduplicator exceeds memory threshold

Closed

split from

SERVER-109016 [CLASSIC] CountScan should spill if allowDiskUse is specified and memory usage has exceeded some limit

Backlog

Assignee:: Foteini Alvanaki
Reporter:: Foteini Alvanaki
Participants:: Foteini Alvanaki, Githook User
Votes:: 0 Vote for this issue
Watchers:: 2 Start watching this issue

Created:: Mar 23 2026 03:54:10 PM UTC
Updated:: Mar 31 2026 06:21:14 AM UTC
Resolved:: Mar 30 2026 08:46:28 AM UTC

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