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Backport(v1.19): test: stabilize in_tail compatibility notification test (#5565) - #5571
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**Which issue(s) this PR fixes**: None. **What this PR does / why we need it**: The compatibility test can race with the stat watcher: after writing the file, the watcher may call on_notify before the test's explicit call. That consumes the test subclass's one-time false response, so the read position has already advanced when the assertion runs. Disable the stat watcher in this test so its explicit notifications control the call order. The failure reported by PR #5529 (GitHub Actions run 39210929391) is this test-ordering instability, not a failure caused by the multithreading implementation. The test uses the default synchronous mode, and this stabilizes a compatibility test introduced by a separate refactoring. **Docs Changes**: None. **Release Note**: None; this only makes a test deterministic. Assisted-by: LLM GPT-6 Luna (OpenAI) --------- Signed-off-by: Takuro Ashie <ashie@clear-code.com> Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Watson1978
approved these changes
Oct 26, 2026
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Which issue(s) this PR fixes:
Backport #5565
None.
What this PR does / why we need it:
The compatibility test can race with the stat watcher: after writing the
file, the watcher may call on_notify before the test's explicit call.
That consumes the test subclass's one-time false response, so the read
position has already advanced when the assertion runs.
Disable the stat watcher in this test so its explicit notifications control
the call order.
The failure reported by PR #5529 (GitHub Actions run 39210929391) is this
test-ordering instability, not a failure caused by the multithreading
implementation. The test uses the default synchronous mode, and this
stabilizes a compatibility test introduced by a separate refactoring.
Docs Changes:
None.
Release Note:
None; this only makes a test deterministic.
Assisted-by: LLM GPT-6 Luna (OpenAI)