Cache.md

Cache

Hybrid Cache

Uses both local and remote cache.

• Local Cache: Caffeine
• Remote Cache: Redis (Lettuce)

• Low latency: Local cache is faster than remote.
• Memory management: handle memory by using LRU policy
• Prevents cache stampede: Minimizes backend load when cache is missing (local cache -> remote cache -> db)
• Clustering: scaling in high traffic, replicate data across node
• Cache warm-up: Updates local cache during server startup.

Redis

• pros:
  • rich data structure: string, list, sorted set, etc
  • persistence: RDB snapshot, AOF logs for backup, recovery
  • replication and clustering: scalability, fault-tolerance
  • atomic operation
  • high performance
• cons:
  • single thread: might cause bottleneck

Memcache

• pros:
  • simplicity: easy to setup, simple key-value
  • performance: fast get/set operation
  • multi thread: multi core process
  • low memory
• cons:
  • no persistence: no backup, data is lost on restart of failure
  • limited data structure
  • no built in clustering
  • only LRU eviction