Tag

stream processing

2 cards

Cards

A late event stamped 10:00:42 arriving after the 10:00 total was published, with event time and processing time shown as two clocks, processing-time windows putting the same event in different buckets, and a watermark closing the window

Data PlatformDay 86Oct 26, 2026

The Event That Arrives After We Closed The Books

system-design data-platform event-time

The Lambda architecture running a batch layer and a streaming layer into a serving layer that merges both, set against Kappa's single stream where reprocessing means replaying the log from offset zero, and a table comparing pipelines, goals, reprocessing and trade-offs

Data PlatformDay 85Oct 26, 2026

Two Pipelines, One Truth, Endless Pain

system-design data-platform lambda-architecture