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Google Cloud Pub/Sub Lite is a high-volume, low-cost messaging service designed for workloads that can tolerate zonal availability and require predictable pricing. It uses the same publish-subscribe model as standard Pub/Sub but trades some features for significantly lower costs — making it ideal for high-throughput streaming scenarios where cost efficiency is paramount.
| Feature | Pub/Sub (Standard) | Pub/Sub Lite |
|---|---|---|
| Availability | Multi-zone (regional) | Single zone (zonal) or multi-zone (regional Lite) |
| Pricing | Per-message data volume | Reserved capacity (throughput + storage) |
| Scaling | Fully automatic | Manual partition and capacity management |
| Throughput | Unlimited (auto-scaled) | Provisioned per partition |
| Storage | Included in message price | Provisioned separately |
| Message ordering | Per ordering key | Per partition (like Apache Kafka) |
| Exactly-once | Supported | Not supported |
| Dead-letter topics | Supported | Not supported |
| Push subscriptions | Supported | Not supported |
| BigQuery export | Supported | Via Dataflow |
| Global topics | Supported | Not supported |
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