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Cloud / AWS ElastiCashe

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1. What is Amazon ElastiCache?

Amazon ElastiCache is a serverless, Redis- and Memcached-compatible caching service delivering real-time, cost-optimized performance for modern applications. ElastiCache scales to hundreds of millions of operations per second with microsecond response time, and offers enterprise-grade security and reliability.

With a few clicks on the AWS Management Console, you can quickly add a caching or in-memory layer using Amazon ElastiCache to your application design. A robust solution that reduces the danger of overcrowded databases, which degrade website and application load times, is provided by Amazon ElastiCache after a cluster is established. This technology automatically identifies and replaces failing nodes. The integration of Amazon ElastiCache with Amazon CloudWatch monitoring improves insight into the crucial performance indicators related to your nodes.

2. Explain the architecture of Amazon ElastiCache?

Amazon ElastiCache consists of two primary components: cache clusters and cache nodes.

Cache clusters are groups of cache nodes working together, providing horizontal scaling and high availability. They can be partitioned into shards to distribute data across multiple nodes, improving performance by reducing the load on individual nodes.

Cache nodes are the building blocks of ElastiCache, responsible for storing and retrieving data. Each node runs an engine (either Redis or Memcached) optimized for low-latency, high-throughput operations.

3. How does ElastiCache help in improving the performance of web applications?

ElastiCache improves web application performance by,

  • Caching frequently accessed data, reducing latency by serving it directly from memory instead of querying databases.
  • Offloading read-heavy workloads from databases, allowing them to focus on write operations.
  • Supporting write-heavy workloads with RedisÂ’ built-in replication and persistence features.
  • Scaling horizontally by adding more nodes or vertically by increasing node size, accommodating growing traffic demands.
  • Providing automatic failover and recovery mechanisms, ensuring high availability and fault tolerance.
4. Explain nodes, shards, and clusters of Amazon ElastiCache.

A node is the smallest building block of an Amazon ElastiCache deployment. It is a fixed-size chunk of secure, network-attached RAM. Each node runs the engine that was chosen when the cluster or replication group was created or last modified. Each node has its own Domain Name Service (DNS) name and port.


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