General
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General
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### CDN (CloudFront
Cloudflare
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General
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- Configure cache-control headers (`max-age`
`s-maxage`
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- **No monitoring or alerting**: Operating caches blind without visibility into hit rates
latency
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- Implement consistent hashing client-side (e.g.
libketama) for predictable key distribution
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- Monitor with `INFO` command metrics: `keyspace_hits`
`keyspace_misses`
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### Memcached (Distributed
Multi-threaded)
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- Configure `maxmemory-policy` per instance based on workload (allkeys-lfu for general caching
volatile-ttl for mixed workloads)
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### Redis (Clusters
Sentinel
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- Enable compression (LZ4
Snappy) for large values where CPU overhead is acceptable
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- Choose binary serialization (Protocol Buffers
MessagePack) over JSON for reduced size and faster parsing
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- Use hierarchical namespaced keys (e.g.
`app:user:123:profile`) for logical grouping and bulk invalidation
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- [ ] Security controls (TLS
authentication
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- [ ] Monitoring covers hit rates
latency
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- Create benchmark suite measuring cache hit rates
latency percentiles (p50
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- Define alerting thresholds for cache health (hit rate drops
latency spikes
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- Document cache key schema with namespaces
versioning
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- **Cost optimization**: Right-sizing cache instances
tiered storage (hot/warm/cold)
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- **High availability**: Redis Sentinel or Cluster mode
Memcached replication
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- **Security**: Encryption in transit (TLS)
authentication (Redis AUTH
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- **Cache stampede prevention**: Mutex locks
probabilistic early expiration
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- **Hot key mitigation**: Local caching of hot keys
key replication across shards
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- **CDN caching**: Static assets
dynamic page caching with edge-side includes
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- **Application-level caching**: In-process caches (e.g.
Guava
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