About this episode
In the seventh episode of this podcast, your hosts Francesc and Mark discuss the different ways messaging can be done on Google Cloud Platform, covering Pub/Sub and Task Queues and when to choose what.
Links:
- Google Cloud Vision API blog post
- Photo Scavenger Hunt app
- Google Task Queues documentation
- Google Cloud Pub/Sub documentation
- Exporting logs documentation
Feature comparison
| Feature | Task Queues | Pub/Sub |
| Pull via API | Yes | Yes |
| Push via Webhooks | Yes | Yes |
| Max size of message | 100K | 10MB |
| At least once delivery guarantee | Yes | Yes |
| Batch Insert | Only in App Engine | Yes |
| Multiple receivers | No | Yes |
| Datastore Transactions | Yes | No |
| Maximum Messages/s | 1B (with billing) 250 msg/q/s | Unlimited (after request) |
| Throttling | Yes | No (if needed → pull) |
| Performance | median 5ms (99%ile 300ms) | Sub-second even when tested at over 1M msg/s |
| Cloud Monitoring | No | Yes |
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