1. Distributed and centralized (ZooKeeper Notebook)

1. Centralized characteristics

A central node composed of one or more host computers, the data is centrally stored on this intermediate node, and all the business units of the whole system are centrally deployed on this central node, and all the functions of the system are centrally processed. In short: the terminal or client is only responsible for the input and output of data, and the storage and control of data is completed by the host. Advantages

Disadvantages of simple deployment structure

The mainframe is expensive 2. Distributed characteristics

The components of a hardware or software are distributed on different network computers and communicate and coordinate with each other through message passing. Characteristic distribution

Multiple computers in a distributed system will be distributed at will in space and can be changed at any time. Reciprocity

Multiple computers have no distinction between master and slave and can provide data and services. If one of the data is lost, a copy of the data can be made from the other host. Concurrency

Operate some shared resources at the same time.