Here is a comparison table highlighting the differences between Amazon Elasticsearch Service (now known as Amazon OpenSearch Service) and Amazon ElastiCache Service:
| Feature/Aspect | Amazon OpenSearch Service | Amazon ElastiCache |
|---|---|---|
| Purpose | Search, analytics, and log analysis | In-memory caching and database |
| Primary Use Cases | Full-text search, log analytics, real-time analytics | Caching frequently accessed data, session management, real-time data processing |
| Data Storage | Persistent storage | In-memory storage |
| Data Types | JSON documents | Key-value pairs |
| Engines Supported | OpenSearch, Elasticsearch | Redis, Memcached |
| Query Language | OpenSearch Query DSL, Elasticsearch Query DSL | Redis commands, Memcached commands |
| Scaling | Automated scaling with domain settings | Cluster mode enabled for sharding, replica sets for scaling |
| High Availability | Multi-AZ deployments | Multi-AZ with automatic failover |
| Backup and Restore | Automated and manual snapshots | Automatic snapshots for Redis |
| Security Features | VPC support, IAM policies, encryption at rest and in transit, fine-grained access control | VPC support, IAM policies, encryption at rest and in transit |
| Monitoring and Metrics | CloudWatch metrics, OpenSearch/Elasticsearch cluster health and performance monitoring | CloudWatch metrics, Redis/Memcached-specific metrics |
| Integration | Integration with other AWS services (e.g., Kinesis, Lambda, CloudWatch) | Integration with other AWS services (e.g., RDS, DynamoDB, CloudWatch) |
| Cost | Based on instance type, storage, and data transfer | Based on node type, number of nodes, and data transfer |
| Instance Types | Various instance types optimized for search and analytics workloads | Various instance types optimized for memory and performance |
| Configuration Management | Managed service with automated patches and updates | Managed service with automated patches and updates |
Summary
- Amazon OpenSearch Service (formerly Amazon Elasticsearch Service) is primarily used for search, log analytics, and real-time analytics with persistent storage of JSON documents.
- Amazon ElastiCache is used for caching, session management, and real-time data processing with in-memory storage, supporting Redis and Memcached engines.
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