Streaming Events vs Live Queries, a deeper look at Subscription Patterns

on YouTube ↗24m

" summary

Compares two GraphQL subscription patterns implemented in Hasura: live queries for current state and streaming events for event archives, with a demo chat app that streams batched updates. Claims the system groups listeners, uses predicate pushdown and per-client batch size to reduce DB load, and has scaled to 1 million rows updated per second. Requires a single-column monotonic cursor and has no server-side backpressure; runs on Docker or Hasura Cloud (free tier) and exposes authZ at the query level.

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" chapters (5)

1. 0:00Start
2. 4:31What are Subscriptions?
3. 6:20Event Driven Architecture!
4. 11:34Subscriptions: Streams
5. 17:52Differences

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