*: downgrade log-level of some noisy logs

[LykxSassinator]

Description

close #439

Downgrade the log-level of noisy logs when calling PrefetchTail.

Summary by CodeRabbit

• Bug Fixes
  • Reduced the visibility of routine tail prefetch size messages by logging them at debug level instead of warning level.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e599bef9-1aec-46fc-a924-39b8fabb5a33

📥 Commits

Reviewing files that changed from the base of the PR and between d359069 and af09df3.

📒 Files selected for processing (1)

• table/block_based/block_based_table_reader.cc

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e29c471e-7a95-4b2d-bcaa-a0b546fdd73b

📥 Commits

Reviewing files that changed from the base of the PR and between 52b6fe1 and d359069.

📒 Files selected for processing (1)

• table/block_based/block_based_table_reader.cc

🚧 Files skipped from review as they are similar to previous changes (1)

• table/block_based/block_based_table_reader.cc

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📝 Walkthrough

Walkthrough

BlockBasedTable::PrefetchTail now emits heuristic and statistics-derived tail prefetch messages at debug level. Prefetch sizing and control flow remain unchanged.

Changes

Tail prefetch logging

Layer / File(s)	Summary
Adjust tail prefetch log levels table/block_based/block_based_table_reader.cc	The two tail prefetch diagnostic messages change from warning logs to debug logs.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to d3590

This is a narrowly scoped log-level adjustment with no actionable merge-blocking risk remaining; it is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR demotes noisy logs but does not add the required Statistics tickers for tail prefetch size sources [#439].	Add and increment the manifest, statistics, and heuristics tail prefetch Statistics tickers in PrefetchTail().
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the primary change: lowering the log level for noisy messages.
Out of Scope Changes check	✅ Passed	The reported change is limited to log-level updates in PrefetchTail() and is within the linked issue scope [#439].

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gengliqi, overvenus

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Needs approval from an approver in each of these files:

• OWNERS [gengliqi,overvenus]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-08-20 13:14:23.034614464 +0000 UTC m=+161898.205708568: ☑️ agreed by gengliqi.
• 2026-08-24 03:38:05.414654052 +0000 UTC m=+472920.585748187: ☑️ agreed by overvenus.