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Type: Improvement
Resolution: Fixed
Priority: Major - P3
Fix Version/s: WT11.2.0, 7.3.0-rc0, 7.2.0-rc2
Affects Version/s: None
Component/s: None
Labels:
- code-quality
- wt-atomic

Epic Link:
PM-3221

Story Points:
8
Sprint:
ASeasonTooMany-2023-08-22, BermudaTriangle- 2023-09-05, TheMoon-StorEng - 2023-09-19, NachoCheese - 2023-10-03, Joker - StorEng - 2023-10-17, Asparagus-StorEng - 2023-10-31, c(3x10^8)-StorEng - 2023-11-14

As part of PM-3221 we're reviewing certain shared variables to see if we can achieve the same concurrent access with mechanisms other than shared variables and memory barriers.

In this ticket we'll review the usage of shared variable WT_CONN->session_cnt and how it is used to allow concurrent access to sessions in the WT_CONN->sessions array.

It's possible an atomic session_cnt would be sufficient we should consider that option.

duplicates

WT-11487 Theoretically session initialization could race with walking the session list on ARM

Closed

is duplicated by

WT-11697 Should read global generation before reading the session count

Closed

related to

WT-11744 Querying a timestamp on the global transaction can be off by one

Open

WT-11983 Coverity analysis defect 138370: Explicit null dereferenced

Closed

Assignee:: Luke Pearson

Reporter:: Andrew Morton

Votes:: 0 Vote for this issue

Watchers:: 3 Start watching this issue

Created:: Jun 25 2023 10:20:36 PM UTC

Updated:: Nov 27 2023 02:51:52 AM UTC

Resolved:: Nov 08 2023 06:15:47 PM UTC

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