fix(tests): deflake test_wal_and_sst_storage_overhead against vanished files

[QuantumExplorer]

Problem

get_files_size in grovedb/src/tests/test_compaction_sizes.rs lists a directory with fs::read_dir and then calls entry.metadata().unwrap() on each entry. RocksDB background compaction can delete a WAL/SST file between the read_dir listing and the metadata() call, making test_wal_and_sst_storage_overhead flaky on CI with Os { code: 2, kind: NotFound } (seen on PR #808, actions run 31806719166).

Fix

Skip entries whose metadata can no longer be read (.filter_map(|entry| entry.metadata().ok())) instead of unwrapping. Measurement semantics are otherwise unchanged — a file deleted by compaction mid-scan simply doesn't count toward the total, which is the correct reading anyway.

Testing

cargo test -p grovedb --all-features --lib test_wal_and_sst_storage_overhead passes.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Improved reliability when checking directory sizes by safely handling files that are removed during the scan.
  • Prevented unexpected failures caused by transient file metadata errors.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: fe897558-c7ff-463d-b81a-6ddc33277380

📥 Commits

Reviewing files that changed from the base of the PR and between 02d0e31 and 7d67377.

📒 Files selected for processing (1)

• grovedb/src/tests/test_compaction_sizes.rs

📝 Walkthrough

Walkthrough

The file-size collection logic now skips files whose metadata lookup fails after directory enumeration. This prevents a panic when concurrent compaction removes those files.

Changes

Compaction size handling

Layer / File(s)	Summary
Metadata error handling grovedb/src/tests/test_compaction_sizes.rs	File-size collection skips entries that produce metadata errors instead of panicking.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: 🔵 Low · up to 02d0e

The change prevents flakes from files deleted during compaction, but it may also hide unrelated filesystem errors and let the storage measurement test pass with incomplete data. The PR is mergeable with explicit owner awareness or a follow-up to ignore only missing-file errors.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the flaky test and the fix for files that disappear during storage overhead measurement.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch claude/hungry-joliot-5af5b4

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@grovedb/src/tests/test_compaction_sizes.rs`:
- Around line 24-27: Update the metadata handling in the compaction size
measurement to ignore only std::io::ErrorKind::NotFound, while propagating all
other metadata errors instead of dropping them. Preserve the existing size
mapping for successfully retrieved metadata.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: bf79a686-8cc5-4ba1-bc7a-897dc65081fa

📥 Commits

Reviewing files that changed from the base of the PR and between ba76763 and 02d0e31.

📒 Files selected for processing (1)

• grovedb/src/tests/test_compaction_sizes.rs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.21%. Comparing base (7db981b) to head (7d67377).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #810   +/-   ##
========================================
  Coverage    92.21%   92.21%           
========================================
  Files          267      267           
  Lines        81620    81658   +38     
========================================
+ Hits         75263    75300   +37     
- Misses        6357     6358    +1     

Components	Coverage Δ
grovedb-core	90.43% <ø> (+<0.01%)	⬆️
merk	93.13% <ø> (-0.01%)	⬇️
storage	87.00% <ø> (ø)
commitment-tree	96.05% <ø> (ø)
mmr	96.79% <ø> (ø)
bulk-append-tree	89.82% <ø> (ø)
element	97.92% <ø> (ø)

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