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README
MulanPSL-2.0

Distributed Configuration Center

分布式配置中心,基于DCF实现的一个状态机,用于实现集群中配置信息管理; openGauss CM依赖DCC组件对配置数据分布式存取,实现集群配置管理高可用能力;

一、工程说明

1、编程语言:C
2、编译工程:cmake或make,建议使用cmake
3、目录说明:
  • DCC:主目录,CMakeLists.txt为主工程入口;
  • src: 源代码目录,按子目录划分模块解耦;
  • test:测试工程
  • build:工程构建脚本

二、编译指导

1、概述

编译DCC需要依赖CBB、DCF和binarylibs三个组件。

  • CBB:DCC依赖的公共函数代码。可以从开源社区获取。
  • DCF:DCC依赖的分布式一致性框架能力。可以从开源社区获取。
  • binarylibs:依赖的第三方开源软件,你可以直接编译openGauss-third_party代码获取,也可以从开源社区下载已经编译好的并上传的一个副本。
2、操作系统和软件依赖要求

支持以下操作系统:

  • CentOS 7.6(x86)
  • openEuler-20.03-LTS 适配其他系统,可参照openGauss数据库编译指导 当前DCC依赖第三方软件有securec、zlib、lz4、zstd、openssl、cjson; 编译DCC依赖的第三方软件要求与编译opengauss对依赖的第三方软件要求一致。
3、下载DCC及依赖组件

可以从开源社区下载DCC、CBB、DCF和openGauss-third_party。 可以通过以下网站获取编译好的binarylibs。 https://opengauss.obs.cn-south-1.myhuaweicloud.com/2.0.0/openGauss-third_party_binarylibs.tar.gz

4、编译第三方软件

在编译DCC之前,需要先编译DCC依赖的开源及第三方软件。这些开源及第三方软件存储在openGauss-third_party代码仓库中,通常只需要构建一次。如果开源软件有更新,需要重新构建软件。 用户也可以直接从binarylibs库中获取开源软件编译和构建的输出文件。

5、代码编译

使用DCC/build/linux/opengauss/build.sh编译代码, 参数说明请见以下表格。

选项 参数 说明
-3rd [binarylibs path] 指定binarylibs路径。该路径必须是绝对路径。
-m [version_mode] 编译目标版本,Debug或者Release。默认Release
-t [build_tool] 指定编译工具,cmake或者make。默认cmake。

现在只需使用如下命令即可编译:
[user@linux dcc]$ sh build.sh -3rd [binarylibs path] -m Release -t cmake
完成编译后,动态库生成在DCC/output/lib目录中

三、接口与使用示例

#####1. 接口说明

参见:DCC/src/interface/dcc_interface.h

#####2. DEMO示例

参见:DCC/test/test_main
demo示例主要演示了一个dcc集群场景,进行简单的键值操作步骤与流程;
示例中主要步骤说明:

  1. dcc参数设置与启动
    srv_set_param("NODE_ID", ... -- 设置当前dcc节点node_id
    srv_set_param("DATA_PATH", ... -- 设置dcc数据路径
    srv_set_param("ENDPOINT_LIST", ... -- 设置dcc集群配置信息
    srv_dcc_register_status_notify() -- 注册dcc角色变更通告回调函数
    srv_dcc_start() -- 启动dcc实例
  2. dcc创建会话并操作
    srv_dcc_alloc_handle(&handle); -- 创建一个dcc会话
    srv_dcc_put(handle, &key, &val, &option) -- 插入一个key/value键值对数据
  3. dcc结束会话与退出
    srv_dcc_free_handle(handle); -- 结束当前已创建的会话
    srv_dcc_stop(); -- 停止当前dcc实例
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You can use this software according to the terms and conditions of the Mulan PSL v2. You may obtain a copy of Mulan PSL v2 at: http://license.coscl.org.cn/MulanPSL2 THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE. See the Mulan PSL v2 for more details. Mulan Permissive Software License,Version 2 Mulan Permissive Software License,Version 2 (Mulan PSL v2) January 2020 http://license.coscl.org.cn/MulanPSL2 Your reproduction, use, modification and distribution of the Software shall be subject to Mulan PSL v2 (this License) with the following terms and conditions: 0. Definition Software means the program and related documents which are licensed under this License and comprise all Contribution(s). Contribution means the copyrightable work licensed by a particular Contributor under this License. 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