Cache

  • A good overview can be found here.

  • Used in managing state of stateless application, reduce load off of databases for read intensive workloads etc.

Caching Strategies

  • Some common strategy based on operation done on the system can be found here.

  • Most popular strategies are,

    • Lazy Loading/Cache Aside/Lazy Population

    • Write Through

Elasti Cache

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Elasti Cache Icon

About

  • Caches are in-memory databases with high performance and low latency.

  • Being a managed service following tasks are managed by AWS,

    • OS maintenance/patching

    • Optimizations

    • Setup

    • Configuration

    • Monitoring

    • Failure recovery and backups

  • Offers managed Redis or Memcached variants.

  • For redis in cluster mode, there can be upto 5 read replicas.

Cache evictions

  • Cache eviction can occur in 3 ways

    • Delete the item explicitly in the cache

    • Item is evicted because the memory is full and is not recently used.

    • You set an item's time-to-live, where in TTL can vary from a few second to hours or days.

  • If too many evictions happen due to memory, you should scale up or out.

Security

  • Encryption at rest and transit is available to make sure data is secure.

References

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