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| Single Cluster | Active/Active HA | Cluster Sharding | ||
|---|---|---|---|---|
| Operational complexity | ⭐⭐⭐⭐ | ⭐ | ⭐⭐⭐ | |
| Cost efficiency | ⭐⭐⭐⭐⭐ | ⭐ | ⭐⭐⭐⭐ | |
| Scaling behaviour (autoscaling/load spikes) | ⭐⭐⭐ | ⭐⭐ | ⭐⭐⭐⭐⭐ | |
| Developer experience (deployments/scaling configs/alerts) | ⭐⭐⭐⭐⭐ | ⭐⭐ | ⭐⭐⭐⭐ | |
| Reliability under load / maintenance | ⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐ | |
| Cross-team coordination overhead | ⭐⭐ | ⭐ | ⭐⭐⭐ | |
| Blast-radius reduction | ⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | |
| Support for singletons / stateful consumers | ⭐⭐⭐⭐⭐ | ⭐ | ⭐⭐⭐⭐⭐ | |
| Overall score | 3.3 | 1.7 | 4.1 |
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