Implement correct calculation for checkpointingTimestampGap#813
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FileSystemGuy merged 2 commits intoJul 17, 2026
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This fixes #812 @FileSystemGuy |
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…#814) #813 switched 2.1.24 checkpointingTimestampGap from the DLIO summary start/end to the invocation bookends (metadata.invocation_start_time / invocation_end_time), but shipped without a test — the existing 2.1.24 cases all pass metadata={} and exercise only the summary fallback, leaving the new bookend behavior uncovered. Add three cases to the 2.1.24 sentinel file: - gap_uses_invocation_bookends_not_summary: the #812 scenario — a valid pair whose true quiet window is 5 s but whose DLIO summary window is inflated to a 65 s apparent gap by read startup + write cluster collection. Must pass. (Verified RED against the pre-#813 summary-based code, GREEN with #813.) - bookend_gap_still_flags_a_genuine_long_pause: a 5-minute bookend gap against 10 s invocations must still fail — the source-swap must not neuter the check. - falls_back_to_summary_when_bookends_absent: pre-bookend results dirs (metadata without the keys) still validate via the summary fallback. Test-only; the fix landed in #813.
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