FA-45664 / Data systems / Member archive

Watermark buffering rejects an event exactly at the watermark · case 04

Watermark buffering rejects an event exactly at the watermark.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Process event actions [event,time,id] and watermark actions [watermark,time,None]. Maintain monotone watermark; events older than it go to late output. On a watermark, release buffered events with time strictly below watermark ordered by (time,id). Return [emitted,late,sorted-pending].

Why this case matters

A bounded deterministic data engine model makes representation and changelog faults reproducible.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
frontier equality	`[[], [[4, 10]], []]`	`[[], [], [[4, 10]]]`	Failed

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