Elasticache cluster

What is an ElastiCache cluster?

Clusters. The basic building block of ElastiCache for Redis is the cluster. A cluster is a collection of one or more cache nodes, all of which run an instance of the Redis cache engine software. When you create a cluster, you specify the engine and version for all of the nodes to use.

What is ElastiCache used for?

You can use ElastiCache for caching, which accelerates application and database performance, or as a primary data store for use cases that don't require durability like session stores, gaming leaderboards, streaming, and analytics. ElastiCache is compatible with Redis and Memcached.

What are nodes and clusters in 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.

How do you create a cluster in ElastiCache?

On the ElastiCache dashboard page, choose Create cluster and then choose Create Redis cluster. Under Cluster settings, do the following: Choose Configure and create a new cluster. For Cluster mode, choose Enabled.

What is a cache cluster?

A cache cluster, also known as OracleAS Cluster (Web Cache), is a loosely coupled collection of cooperating Web cache instances working together to provide a single logical cache.

What is Redis cluster used for?

Redis Cluster provides a way to run a Redis installation where data is automatically sharded across multiple Redis nodes. Redis Cluster also provides some degree of availability during partitions—in practical terms, the ability to continue operations when some nodes fail or are unable to communicate.

Is ElastiCache a storage service?

Amazon ElastiCache is a fully managed in-memory data store and cache service by Amazon Web Services (AWS). The service improves the performance of web applications by retrieving information from managed in-memory caches, instead of relying entirely on slower disk-based databases.

What are two advantages of using ElastiCache?

Amazon ElastiCache can be used as a highly available in-memory cache to decrease access latency, increase throughput and ease the load off your relational or NoSQL database, with sub-millisecond response times for either Redis or Memcached engines.

What is the difference between Redis and ElastiCache?

A big difference between ElastiCache and Redis is that Amazon Elasticache is a managed platform, whereas Redis is an open-source caching service and data store.

Why are there 3 clusters of nodes?

In order for clustered systems to maintain 100% uptime and ensure data integrity (and avoid the “split brain” problem) there needs to be a third node to act as “arbitrator” to make sure the two nodes are functioning, and each one is aware of the other's health.

What is a cluster vs node?

At a high level, a computer cluster is a group of two or more computers, or nodes, that run in parallel to achieve a common goal. This allows workloads consisting of a high number of individual, parallelizable tasks to be distributed among the nodes in the cluster.

How do I create a cluster group?

In the top right corner of the Cluster groups page, click Create Cluster Group. On the Create cluster group page, provide a name for the cluster group (for example, myusername -clusters ), and then click Create. On the Cluster groups page, click the name of the cluster group you just created.

What is a cluster in Amazon ECS?

An Amazon ECS cluster is a logical grouping of tasks or services. Your tasks and services are run on infrastructure that is registered to a cluster.

What is the difference between Redis and Redis cluster?

The Redis Cluster supports only one database - indicated if you have a big dataset - and Redis supports multiple databases. The Redis Cluster client must support redirection, while the client used for Redis doesn't need it.

What is Memcached cluster?

A Memcached cluster is a logical grouping of one or more ElastiCache nodes. Data is partitioned across the nodes in a Memcached cluster. Many ElastiCache operations are targeted at clusters: Creating a cluster.

What is the difference between Redis and ElastiCache?

A big difference between ElastiCache and Redis is that Amazon Elasticache is a managed platform, whereas Redis is an open-source caching service and data store.

What is the difference between a pod and a cluster?

A pod is a unit of replication on a cluster; A cluster can contain many pods, related or unrelated [and] grouped under the tight logical borders called namespaces.”

What is the difference between ECS service and cluster?

Service — Defines long running tasks of the same Task Definition. This can be 1 running container or multiple running containers all using the same Task Definition. Cluster — A logic group of EC2 instances. When an instance launches the ecs-agent software on the server registers the instance to an ECS Cluster.

What are Clusters in containers?

A Kubernetes cluster is a set of nodes that run containerized applications. Containerizing applications packages an app with its dependences and some necessary services. They are more lightweight and flexible than virtual machines.

Is Redis a cluster?

Redis (cluster mode enabled) supports partitioning your data across up to 500 node groups. You can dynamically change the number of shards as your business needs change. One advantage of partitioning is that you spread your load over a greater number of endpoints, which reduces access bottlenecks during peak demand.

Is cluster same as node?

A cluster node is a Microsoft Windows Server system that has a working installation of the Cluster service. By definition, a node is always considered to be a member of a cluster; a node that ceases to be a member of a cluster ceases to be a node.