能否替换tidb的存储？

yytest · 2024 年4 月 10 日 00:23

目前可以对接的，应该是tikv和tiflash。其他的对接方案，有待官方的验证。

洪七表哥 · 2024 年4 月 10 日 00:37

只是理论上可行，但和开发一个新数据库的工作量相比也差不多

舞动梦灵 · 2024 年4 月 10 日 07:00

感觉除非你底层重新开发的存储。

stokcli · 2024 年4 月 10 日 07:03

好奇，这样做的意义是啥？

有猫万事足 · 2024 年4 月 10 日 07:12

不是不行，但是代价是很大的。

具体可以看看tiflash的这个架构介绍。

github.com

pingcap/tiflash/blob/master/docs/design/0000-00-00-architecture-of-distributed-storage-and-transaction.md

# Architecture Of Distributed Storage Engine And Transaction Layer

- Author(s): [Zhigao Tong](http://github.com/solotzg), [birdstorm](https://github.com/birdstorm), [Calvin Neo](https://github.com/CalvinNeo)

## Introduction

There is already a distributed `OLTP`(Online transaction processing) storage product [TiKV](https://github.com/tikv/tikv).
To make TiDB applicable to the `HTAP`(Hybrid transaction/analytical processing) scenario, we need a specialized analytical engine called `TiFlash`, to enhance the ability of real-time analytics.
Unlike other typical `OLAP`(Online analytical processing) databases which only guarantee `Eventual Consistency`, TiFlash is built on the same distributed infrastructure(`Multi-raft RSM`, `Percolator Transaction Model`) like TiKV.
TiFlash is designed to provide `Strong Consistency` read services.
It means any other component, like TiDB or TiSpark, can access TiFlash and TiKV by the same protocol, which ensures consistency is snapshot read.

## Design

### Overview

![tiflash-overall](./images/tiflash-overall.svg)

After one TiFlash node is deployed into the TiDB cluster, it will register necessary properties(labels with `engine`:`tiflash`, address, runtime information, etc.) to [Placement driver](https://github.com/tikv/pd)(hereafter referred to as `PD`) as a `raft store`.

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tiflash就没有使用rocksdb存储数据。它使用了列存，但是它通过
TiDB Engine Extensions Library
告诉tidb它一个tikv。TiDB Engine Extensions Library实现了一些raft相关的功能。仍然需要实现一堆对应的存储接口才能工作。

TiDBer_Lee · 2024 年4 月 11 日 11:54

单机场景用mysql就行了

system · 2024 年6 月 10 日 11:55

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