Windowing.

also: tumbling window · tumbling windows · session window · session windows

Grouping a stream into time windows: tumbling (fixed, non-overlapping), sliding (overlapping) or session (closed after an inactivity gap).

the two-minute refresher

Tumbling: [00:00-01:00), [01:00-02:00)… each event in exactly one window.
Sliding: windows overlap, so one late event can be late for several windows.
Session: closes after a gap of inactivity; a late event can extend or merge sessions.
A window fires when the watermark passes its end.

also: tumbling window · tumbling windows · session window · session windows

Grouping a stream into time windows: tumbling (fixed, non-overlapping), sliding (overlapping) or session (closed after an inactivity gap).

Tumbling: [00:00-01:00), [01:00-02:00)… each event in exactly one window.
Sliding: windows overlap, so one late event can be late for several windows.
Session: closes after a gap of inactivity; a late event can extend or merge sessions.
A window fires when the watermark passes its end.