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README
GPL-2.0

README

Cantian引擎,是一个存储引擎,采用了存算分离的架构,通过分布式缓存技术、事务MVCC机制、多主集群高可用等关键技术,可以让普通的单机数据库变得具有类似Oracle RAC的多读多写能力。

Cantian引擎无需修改已有数据库的实现,可以以无侵入的方式被MySQL等数据库加载运行。

类似Oracle RAC,Cantian引擎的多读多写,也需要基于共享存储来构建。任何能够提供共享存储并可以提供标准文件接口的存储系统都可以进行对接测试。

主要价值

部署Cantian引擎后,性能可以获得倍数级提升,且无需被动分库分表,故障倒换时间大幅缩减。

架构简介

Cantian引擎主要由五个主要部分组成:

  • CTC(Cantian Connector):负责支持Cantian引擎作为分布式数据库的存储引擎插件,支持DDL、DML、事务等数据库功能,兼容分布式数据库的生态应用。
  • CMS(Cluster Manager Service): 负责集群管理。
  • 多读多写模块:Cantian引擎是基于共享存储的多写集群,各个节点在架构上对等,多读多写模块确保从任何一个节点都可以对数据库做DDL/DML/DCL等操作。任何一个节点做的修改,在满足隔离级别的要求下,其他节点都可以看到。所有计算节点共享和读写存储上同一份用户数据。
  • 存储访问层:Cantian引擎通过共享存储提供的接口,例如标准文件接口,对数据进行读写操作,同时借助文件系统提供的锁机制进行互斥。
  • 工具:包括备份恢复工具:将数据库下的所有表导出成SQL语句或者表格文本,逻辑恢复时再将文本格式的逻辑数据文件导入到数据库中。运维管理工具:各自命令行等。

更详细的Cantian引擎架构介绍,请参考对应版本的《技术白皮书》

主要特性

  • 多读多写

    Cantian引擎是基于共享存储的多写集群,各个节点在架构上对等,从任何一个节点都可以对数据库做DDL/DML/DCL等操作。任何一个节点做的修改,在满足隔离级别的要求下,其他节点都可以看到。所有计算节点也都可以共享和读写存储上的同一份用户数据。

  • 集群管理

    Cantian引擎支持通过CMS(Cluster manager server)进行集群管理,包括集群成员状态维护、集群异常处理、仲裁等。

  • 支持与MySQL对接

    作为MySQL数据库的存储引擎插件,Cantian引擎支持DDL、DML、事务等数据库功能,兼容MySQL(InnoDB)的生态应用。

  • 支持MySQL共享系统表

    MySQL8.0默认的系统表元数据存储引擎为innodb,Cantian作为一个存储引擎,也有其系统表元数据,通过修改MySQL初始化流程将系统表的存储引擎改为Cantian,可以使Cantian引擎能够存放MySQL的元数据。

  • 支持滚动升级

    Cantian引擎支持集群离线方式进行升级(离线升级),也支持在线进行版本升级(滚动升级),从而保证版本升级不影响客户业务的连续性。

  • 备份功能

    数据备份是容灾的基础,本特性旨在为Cantian引擎提供备份恢复功能,通过合理规划备份方式和备份频率,避免意外状况下的数据损失。

各个特性的实现原理和详细说明,请参考对应版本的《技术白皮书》

工程说明

  • 编程语言:C

  • 编译工程:cmake或make,建议使用cmake

  • 目录说明:

    目录名称

    说明

    CI

    执行Cantian引擎测试用例的脚本。

    build

    编译构建Cantian引擎工程的脚本。

    common

    后台定时任务运行(管控面)脚本。

    ct_om

    安装部署脚本。

    document

    项目参考文档,包括《编译指南》、《安装指南》等。

    docker

    启动Cantian引擎容器镜像的相关脚本。

    library

    编译头文件库。

    pkg

    Cantian引擎源代码目录,按子目录划分模块解耦。

版本发布分支

“cantian24.*”为正式的版本发布分支,例如,“cantian24.6”表示2024年6月所发布版本对应的分支。您可以进入发行版获取对应节点的源码。

如何使用

要完成Cantian引擎的部署,您需要先编译源码生成Cantian引擎软件包。在完成组网规划、网络配置等操作后,安装Cantian引擎和对接MySQL。同时,在完成部署后进行健康巡检。

步骤

说明

1-软件包编译

Cantian引擎源码进行编译,生成Cantian引擎软件包。请参考对应版本的《编译指南》获取详细操作步骤。

2-安装部署

安装Cantian引擎和对接MySQL,包括组网规划、网络配置、启动Cantian引擎、加载插件依赖库等。请参考对应版本的《安装指南》获取详细操作步骤。

3-安装后巡检

Cantian引擎执行健康巡检,了解Cantian引擎各模块的运行状态。请参考对应版本《管理员指南》的“健康巡检”章节获取详细操作步骤。

如何提交贡献

我们非常欢迎新贡献者加入到项目中来,也非常高兴能为新加入贡献者提供指导和帮助。

  • 如果您发现了一个bug或者有一些想法想要交流,欢迎您提交issue。具体操作方法可参考Issue提交指南
  • 您也可以通过提交PR的方式进行贡献,在您贡献前,需先签署CLA。PR的提交的操作方法,可参考PR提交指南
  • 同时,也欢迎您在Issue和PR中提交评论。

许可证

Cantian引擎使用“木兰宽松许可证”(Mulan PSL V2)开源协议许可。

木兰宽松许可证, 第2版 木兰宽松许可证, 第2版 2020年1月 http://license.coscl.org.cn/MulanPSL2 您对“软件”的复制、使用、修改及分发受木兰宽松许可证,第2版(“本许可证”)的如下条款的约束: 0. 定义 “软件” 是指由“贡献”构成的许可在“本许可证”下的程序和相关文档的集合。 “贡献” 是指由任一“贡献者”许可在“本许可证”下的受版权法保护的作品。 “贡献者” 是指将受版权法保护的作品许可在“本许可证”下的自然人或“法人实体”。 “法人实体” 是指提交贡献的机构及其“关联实体”。 “关联实体” 是指,对“本许可证”下的行为方而言,控制、受控制或与其共同受控制的机构,此处的控制是指有受控方或共同受控方至少50%直接或间接的投票权、资金或其他有价证券。 1. 授予版权许可 每个“贡献者”根据“本许可证”授予您永久性的、全球性的、免费的、非独占的、不可撤销的版权许可,您可以复制、使用、修改、分发其“贡献”,不论修改与否。 2. 授予专利许可 每个“贡献者”根据“本许可证”授予您永久性的、全球性的、免费的、非独占的、不可撤销的(根据本条规定撤销除外)专利许可,供您制造、委托制造、使用、许诺销售、销售、进口其“贡献”或以其他方式转移其“贡献”。前述专利许可仅限于“贡献者”现在或将来拥有或控制的其“贡献”本身或其“贡献”与许可“贡献”时的“软件”结合而将必然会侵犯的专利权利要求,不包括对“贡献”的修改或包含“贡献”的其他结合。如果您或您的“关联实体”直接或间接地,就“软件”或其中的“贡献”对任何人发起专利侵权诉讼(包括反诉或交叉诉讼)或其他专利维权行动,指控其侵犯专利权,则“本许可证”授予您对“软件”的专利许可自您提起诉讼或发起维权行动之日终止。 3. 无商标许可 “本许可证”不提供对“贡献者”的商品名称、商标、服务标志或产品名称的商标许可,但您为满足第4条规定的声明义务而必须使用除外。 4. 分发限制 您可以在任何媒介中将“软件”以源程序形式或可执行形式重新分发,不论修改与否,但您必须向接收者提供“本许可证”的副本,并保留“软件”中的版权、商标、专利及免责声明。 5. 免责声明与责任限制 “软件”及其中的“贡献”在提供时不带任何明示或默示的担保。在任何情况下,“贡献者”或版权所有者不对任何人因使用“软件”或其中的“贡献”而引发的任何直接或间接损失承担责任,不论因何种原因导致或者基于何种法律理论,即使其曾被建议有此种损失的可能性。 6. 语言 “本许可证”以中英文双语表述,中英文版本具有同等法律效力。如果中英文版本存在任何冲突不一致,以中文版为准。 条款结束 如何将木兰宽松许可证,第2版,应用到您的软件 如果您希望将木兰宽松许可证,第2版,应用到您的新软件,为了方便接收者查阅,建议您完成如下三步: 1, 请您补充如下声明中的空白,包括软件名、软件的首次发表年份以及您作为版权人的名字; 2, 请您在软件包的一级目录下创建以“LICENSE”为名的文件,将整个许可证文本放入该文件中; 3, 请将如下声明文本放入每个源文件的头部注释中。 Copyright (c) [Year] [name of copyright holder] [Software Name] is licensed under Mulan PSL v2. 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It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. <one line to give the program's name and a brief idea of what it does.> Copyright (C) <year> <name of author> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) year name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. <signature of Ty Coon>, 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License.

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Cantian is a storage engine based on shared storage to enable database running in multi-master mode. 展开 收起
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