© XXX Page 1 of 11 CurveFS Client 概要设计（已实现）© XXX Page 2 of 11 背景 概述 关键接口分析 init destroy lookup write read open create & mknod mkdir forget unlink rmdir opendir readdir getattr & setattr access rename 作者 内容 2021-04-27 许超杰 初稿 背景 CurveFS初步设计见 ， 目前需细化Client端设计 CurveFS方案设计（总体设计，只实现了部分） 概述 CurveFS client 向上提供两层接口，分别是© XXX Page 3 of 11 对接fuse，提供通用文件系统接口。对于fuse接口，先前进行了一些调研，见FUSE调研 erblock），块分配器（bitmap）和root inode所在的copyset、 metaserver ip等信息 去metaserver获取文件系统信息（super block），缓存到client端。 destroy void (*destroy) (void *userdata); 清理init缓存的文件系统信息。 lookup void (*lookup) (fuse_req_t

©2024 by josuttis.com 1 C++ Nicolai M. Josuttis josuttis.com @NicoJosuttis Taming the C++ Filter View September 17, 2024 16:45 - 17:45 MDT ©2024 by josuttis.com 2 C++ Nicolai M. Josuttis • Independent Topics: – Systems Architect – Technical Manager – SOA – X and OSF/Motif Nico Josuttis C++ Filter View @cppcon 2024-09-17 1©2024 by josuttis.com 3 C++ Views C++20 ©2024 by josuttis.com 4 C++ C++20: Output: 0 8 15 47 11 42 1 0 1 8 11 15 42 47 C++20 template Nico Josuttis C++ Filter View @cppcon 2024-09-17 2©2024 by josuttis.com 5 C++ C++20: Views void print(const auto& coll) { for

C++: string_view: Deep dive Jasmine Lopez Prithvi Okade 1Topics • Motivation • Performance benefits & basics • string_view: Constructors, useful functions • string vs. string_view and their interoperability interoperability • When to use string_view • Using string_view safely • Intro to span • span vs. string_view • Case study of an optimization using string_view. 2Motivation • Consider a function foo will end up calling “2”. And the code will miss the niceties of using the string API set. string_view helps in resolving this problem elegantly.Motivation 4 void foo(const std::string& str); void foo(const

URVE基本架构 01 02 03 04 Client总体介绍 热升级NEBD总体介绍 新版本Client/NEBD性能优化CURVE基本架构 • 元数据节点 MDS • 管理和存储元数据信息 • 感知集群状态，合理调度 • 数据节点 Chunkserver • 数据存储 • 副本一致性，raft • 客户端 Client • 对元数据增删改查 • 对数据增删改查 • • 快照克隆服务器CURVE基本架构 01 02 03 04 Client总体介绍 热升级NEBD总体介绍 新版本Client/NEBD性能优化 QEMU、Curve-NBD：上层应用  通过链接curve-client使用curve提供的服务  FileManager：提供接口，记录已挂载卷  FileInstance：对应一个已挂载的卷  LeaseExecuto 行通信  前者负责IO请求  后者负责获取复制组(copyset)的leader  MDSClient：负责与MDS交互，挂卸载卷、获取元数据信息 CLIENT整体架构QEMU： 实现了QEMU block与Client的对接层 向cinder/glance提供了Python API https://github.com/opencurve/curve-qemu-block-driver

© XXX Page 1 of 15 curvefs client 删除文件和目录功能设计© XXX Page 2 of 15 背景 相关调研 moosefs chubaofs 方案设计思考 1.Trash机制是实现1个(类似chubaofs)，还是2个（类似moosefs）？ 2. Trash放在哪里？ 3. 是否需要做session机制（在metaserver打开），来维护inode的打开情况？ 的打开情况？ 方案设计 Trash机制： Session机制： 遗留问题 工作量评估 背景 目前curvefs client版本对删除unlink和rmdir的设计只有简单的删除inode和dentry结构，遗留了nlink和lookup count相关的内容还未实现，是不完备的。本文首先调研moosefs，chubaofs等分布式系统，参考并设计解决上述遗留问题。 当前删除接口代码如下：© count需要减nlookup（forget的参数） 当umount时，所有lookup count减至0 不应该完全依赖forget接口去实现inode的移除，因为forget接口可能不会被内核调用（例如client崩溃） 相关调研 moosefs moosefs 未对接forget moosefs 实现了在mds上open，因此删除时可以判断文件是否被打开 moosefs使用了两种机制，来实现上述功

. . . . . . . . . . . . . . . . . . . . . 210 12.6.3 Sluggish response when using Microsoft RDP client . . . . . . . . . . . 210 12.6.4 Running an iSCSI initiator and target on a single system . . . extremely modular design with well-defined internal programming interfaces and a clean separation of client and server code. This makes it easy to control it from several interfaces at once: for example, you Remote Desktop Protocol (RDP) originally built into Microsoft Windows, with special additions for full client USB support. The VRDE does not rely on the RDP server that is built into Microsoft Windows; instead

. . . . . . . . . . . . . . . . . . . . . 188 12.5.3 Sluggish response when using Microsoft RDP client . . . . . . . . . . . 189 12.5.4 Running an iSCSI initiator and target on a single system . . . extremely modular design with well-defined internal programming interfaces and a clean separation of client and server code. This makes it easy to control it from several interfaces at once: for example, you Remote Desktop Protocol (RDP) originally built into Microsoft Windows, with special additions for full client USB support. The VRDE does not rely on the RDP server that is built into Microsoft Windows; instead

Steven Zou (邹佳), VMware主任工程师/Harbor 核心维护者和架构师 Harbor-助你玩转云原生 关于我 Steven(佳) Zou(邹)，VMware中国研发中心主任工程师， Harbor开源项目架构师及核心维护者，拥有十多年软件研发及 架构经验，获得PMP资格认证及多项技术专利授权。曾在HPE、 IBM等多家企业担任资深软件工程师和架构师，专注于云计算及 云原生 云原生等相关领域的研究与创新。著有《Harbor权威指南》等 书籍。 >> Email: szou@vmware.com >> GitHub ID: steven-zou >> Slack: steven zou 目录 - 开场：云原生与制品管理 - 初识Harbor：云原生制品仓库服务 - 使用Harbor搭建私有制品仓库服务 - 资源隔离与多租户管理模型 - 制品的高效分发(复制、缓存与P2P集成) 推送(push)或者拉取(pull)模式 过滤器 策略 Docker Client push pull pull 制品的高效分发-复制 [2] 主从模式(/中心-边缘模式） 制品的高效分发-缓存 • 在项目级别提供“缓存”能力 • 已缓存下来的制品与“本地”制品无异

. . . . . . . . . . . . . . . . . . . . . 221 12.6.3 Sluggish response when using Microsoft RDP client . . . . . . . . . . . 221 12.6.4 Running an iSCSI initiator and target on a single system . . . extremely modular design with well-defined internal programming interfaces and a clean separation of client and server code. This makes it easy to control it from several interfaces at once: for 14 1 First Remote Desktop Protocol (RDP) originally built into Microsoft Windows, with special additions for full client USB support. The VRDE does not rely on the RDP server that is built into Microsoft Windows; instead

functionality. For example, the RDP server, which can deliver the graphical output of a VM remotely to an RDP client, is a separate module that is only loosely tacked into the virtual graphics device. Live Migration service API is publicly described in a web service description file (in WSDL format), you can write client programs that call the web service in any language with a toolkit that understands WSDL. These days explained in detail in subsequent chapters of this book. There are two ways in which you can write client code that uses the web service: a) For Java as well as Python, the SDK contains easy-to-use classes