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+# 产品思考与设计
+
+## 定位
+提供企业级（高效、稳定、安全、低成本、产品化）的文件分发与管理服务，并成为在该领域的云原生最佳实践与标准解决方案。
+
+## 解决的问题
+
+**架构设计缺陷:** 现有架构很难满足日益增长的文件分发业务需要，在稳定性、效率以及安全性等方面逐渐暴露出不足，并受到越来越多的挑战
+
+**价值渗透不足:** 当前只支持 HTTP 回源协议，针对其他类型的存储（HDFS、各云厂商的存储服务、Maven、YUM 等等）缺乏适配
+
+**分发模式单一:** 目前只支持主动拉取模式，缺少主动推送以及主动同步能力
+
+**产品化能力缺失:** 没有提供完善的控制台功能，比如分发任务管理与管控、数据大盘、多租户以及权限控制等等
+
+## 核心能力
+
+- 通过统一的回源适配层及实现支持各种不同类型存储（HDFS、各云厂商的存储服务、Maven、YUM等等）的P2P文件分发能力
+- 支持更多的分发模式: 主动拉取、主动推送、实时同步、远程复制、自动预热、跨云传输等等
+- 系统之间分离解耦，调度与CDN插件化，且支持按需部署，可轻可重，可内可外，灵活满足不同场景的实际需要
+- 基于 grpc 全新设计的 P2P 协议框架，效率及稳定性更佳
+- 支持加密传输、基于账号的传输鉴权与限流、多租户隔离机制
+- 支持更高效的IO方式: 多线程IO、内存映射、DMA等
+- 支持动态压缩、内存文件系统以及更高效的调度算法，提升分发效率
+- 客户端通过 C/S 模式支持第三方软件原生集成蜻蜓的 P2P 能力
+- 产品化能力: 支持文件上传、各种分发模式的任务管理、数据视图以及全局管控等功能
+- 内外一套，核心特性相互共享，非通用特性各自扩展
+- 与生态进一步集成: Harbor、Nydus（镜像按需下载解决方案）、各云厂商仓库服务等
+
+## 架构设计
+
+### 整体架构
+![alt][arch]
+
+### 关联关系
+
+![alt][association]
+
+### 镜像下载流程
+
+![alt][download-process]
+
+### 子系统功能
+
+**Manager**
+- 动态配置管理
+- 数据大盘 & 带宽计量
+- 文件上传 & 分发管理与管控
+- 文件同步管理
+- 账号 & 权限控制
+- 订阅 & 通知
+- 多租户管理
+- 命令通道服务（通道合一）
+
+**Scheduler**
+- 基于多维度的 P2P 调度策略
+- 智能化调度算法（高级）
+- 调度结果可量化对比以及支持 A/B Testing
+- 调度策略插件化以及 CDN 子系统插件化
+- 元信息下发管道
+- 客户端下载结果和回源结果统计以及与监控服务的对接
+
+**CDN**
+- 多源适配能力，包括目录下载和 Range 下载功能
+- DMA 读写
+- 回源中转
+- 分发预热
+- 动态压缩
+- 存储管理（种子存放、磁盘清理、块级存储）
+- 内存文件系统
+- 安全传输（对称加密、完整性校验等）
+- 存储介质插件化
+
+**Dfget daemon**
+- 多源适配能力，包括目录下载和 Range 下载功能
+- 高效 IO 机制
+- 多下载任务的 IO 调度（高 IO 吞吐量）
+- 减少文件读写次数：改进临时文件存放方式、文件完整性校验改进
+- DMA 读写
+- 流式传输
+- 客户端下载 Proxy 能力（http & https）
+- 单服务进程启动（CS 模式）以及常驻和非常驻模式
+- 失败回源处理
+- 本地缓存能力（客户端 seeder 模式）
+- 客户端优雅升级与部署方案
+- 命令执行
+
+**Framework**
+- 高可用、高性能、易集成
+- 一致性 Hash 算法选主
+- 客户端连接管理
+
+
+[arch]: ../images/arch.png
+[association]: ../images/association.png
+[download-process]: ../images/download-process.png
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