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Type: Task
Resolution: Done
Priority: Major - P3
Fix Version/s: None
Affects Version/s: None
Component/s: Checkpoints
Labels:
None

Epic Link:
Checkpoint size for disagg
Assigned Teams:

Storage Engines, Storage Engines - Persistence
Sprint:
SE Persistence backlog
Story Points:
None

In the process of implementing ~~WT-16561~~, I noticed that all the layered and cursor layered python tests were failing the checkpoint size check introduced in __wt_verify with extremely small discrepancies. Upon investigation I noticed that the ckpt->size was always greater than the accumulated the total_block_size of the btree by a difference that always matched the size of the root page.

This ticket aims to investigate and confirm the cause of this discrepancy.

is related to

WT-15861 Investigate whether we should use the same root page id in disagg

Backlog

WT-16561 Update WT verify to verify b-tree

Closed

WT-16849 Fix checkpoint size mismatch due to double root accounting

Closed

related to

WT-16965 FIx bytes_total over-decrement in rec_write_err for failed delta block writes

Closed

WT-16860 failed: s-outdated-fixmes on infrequent-checks [wiredtiger @ fb837464]

Closed

Assignee:: Mariam Mojid
Reporter:: Mariam Mojid
Votes:: 0 Vote for this issue
Watchers:: 2 Start watching this issue

Created:: Feb 20 2026 03:51:34 AM UTC
Updated:: Mar 18 2026 10:06:42 PM UTC
Resolved:: Mar 18 2026 01:49:35 PM UTC

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