Distributed Caching

Caching

  • Caching is a technique to store frequently used data in a fast access memory rather than accessing data every time from slow access memory.
  • This makes our system fast.
  • It helps to reduce the latency.

  • It also helps to achieve the fault tolerance.

  • There are different types of caching present at different layer of the system Like:

  • Client Side Caching (browser caching)
  • CDN (used to store static data)
  • Load Balancer
  • Server side Application Caching (like Redis etc)

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What is distributed Caching?? ds.PNG - scalability i.e limited space /resources. - single point of failure.

Caching Strategy

1. Caching Aside

  • Application first check the cache.
  • If data found in Cache, it's called Cache Hit and data is returned to the client.
  • If data is not found in Cache, its called Cache Miss.Application fetch the data from DB , store it back to Cache and data is return back to the client.

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2. Read through Cache

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3. Write Around Cache

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4. Write through Cache

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5. Write Back (or Behind) Cache

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