Distributed, clustered, and microservices concept consolidation

A cluster is a physical form, and distributed is a way of working. Distributed: One business splits multiple sub-businesses, deployed on different servers cluster: One business, deployed on multiple servers

1: Distributed refers to the distribution of different businesses in different places. Clustering, however, refers to centralizing several servers together to achieve the same business.

Each node in the distribution can be a cluster. Clusters are not necessarily distributed.

Example: For example, Sina, the number of people who visit, he can do a cluster, the front of a response server, the next few servers to complete the same business, if there is business access, the response server to see which server load is not very heavy, will be to which to complete.

and distributed, from the narrow meaning of understanding, but also similar to the cluster, but its organization is relatively loose, unlike clustering, there is an organizational, a server collapsed, the other servers can be top up.

distributed to each node, all of the different business, a node collapsed, then the business is inaccessible.

2: To put it simply, distributed is to improve efficiency by shortening the execution time of a single task, while clustering increases efficiency by increasing the number of tasks executed per unit of time.

For example, if a task consists of 10 subtasks, each of which takes 1 hours to execute separately, it takes 10 hours to perform the task on a single server.

The distributed scheme provides 10 servers, each server is responsible for only one sub-task, regardless of the dependencies between subtasks, it takes one hours to complete this task. (A typical representation of this mode of operation is the Map/reduce distributed computing model of Hadoop)

The use of cluster scheme, also provides 10 servers, each server can handle this task independently. Assuming 10 tasks arrive at the same time, 10 servers will work at the same time, and after 1 hours, 10 tasks are completed at the same time, so that the entire body, or 1 hours to complete a task.

Good design should be distributed and cluster integration, first distributed re-cluster, the specific implementation is the business split into a lot of sub-business, and then for each sub-business cluster deployment, so that each sub-business if the problem, the entire system will not be affected.

Excerpt from: What is the difference between a distributed and a cluster? Distributed concept reference: Features and design concepts of distributed systems

In addition, there is a concept similar to the distribution, that is, microservices.

MicroServices are an architectural style, and a large, complex software application consists of one or more microservices. Each micro-service in the system can be deployed independently, and the various microservices are loosely coupled. Each microservices is focused on completing a task and doing it well. In all cases, each task represents a small business capability.

Micro-service Concept reference: Analytic microservices Architecture (i): what is microservices