概念

📄️ 整体架构

ArchitectureThe CnosDB architecture mainly includes two types of processes: CnosDB and CnosDB meta, named cnosdb and cnosdb-meta respectively. CnosDB supports online horizontal expansion of nodes. Supports metadata and data backup to ensure cluster stability. Support for most SQL syntax, using the built-in cnosdb-cli client can quickly and easily connect to CnosDB for query and import.

📄️ 基础概念

前言

📄️ Cloud Native

Basic Concepts of Cloud Native

📄️ Compression Algorithm

时序数据规模很大，且可能存在大量冗余，因而在时序数据库中经常使用压缩方法来节约存储空间和查询执行时的I/O代价，下面将讨论一些时序数据库中常见的压缩技术。

📄️ Quorum Algorithm

Quorum algorithm is a voting algorithm commonly used in distributed systems to ensure data redundancy and eventual consistency. Quorum is used to ensure that if some participants fail, we can still collect votes from the surviving participants and continue to execute the algorithm. A Quorum represents the minimum number of votes needed to perform an action, typically a majority of participants. The core idea behind Quorum is that even if participants fail or happen to be separated by network partitions, at least one of them can act as an arbiter to ensure the accuracy of the protocol.When "W + R > N", the latest data can be determined by timestamp, version number, etc. In other words, under the combination of parameters that meet this condition, the strong consistency of data can be realized.Quorum 表示执行操作所需的最小票数，通常为多数派的参与者。Quorum 背后的核心思想就是，即使参与者发生故障或恰好被网络分区隔开，也至少有一个参与者可以充当仲裁者，以确保协议的准确性。

📄️ Raft Replication

In distributed systems, Raft is a consensus algorithm used to replicate logs to ensure agreement across multiple nodes. The nodes in Raft algorithm are classified as leaders, followers, and candidates.Raft算法中的节点分为领导者（leader）、跟随者（follower）和候选者（candidate）。

📄️ 存算分离

Design Objectives