Instance Region 1:[a-e] Region 3:[k-o] Region 5:[u-z] ... Region 4:[p-t] RocksDB Instance Region 1:[a-e] Region 2:[f-j] Region 4:[p-t] ... Region 3:[k-o] RocksDB Instance Region 2:[f-j] Region 5:[u-z] Region 3:[k-o] ... RocksDB Instance Region 1:[a-e] Region 2:[f-j] Region 5:[u-z] ... Region 4:[p-t] Raft group Storage stack 2/2 ● Data is organized by Regions ● Region: a set RocksDB ··· Raft ● 复制/分裂/负载均衡 Region 1:[a-e] split Region 1.1:[a-c] Region 1.2:[d-e] split 分裂: 1/4 TiKV1 Region 1:[a-e] TiKV2 Region 1:[a-e] TiKV3 Region 1:[a-e] raft raft Leader Follower

TiDB Yao Wei | PingCAP About me ● Yao Wei (姚维) ● TiDB Kernel Expert, General Manager of South Region, China ● 360 Infra team / Alibaba-UC / PingCAP ● Atlas/MySQL-Sniffer ● Infrastructure software Metadata / Timestamp request Stateless SQL Layer Distributed Storage Layer ... TiKV - Overview • Region: a set of continuous key-value pairs • Data is organized/stored/replicated by Regions • Highly Node/Region Info Management Command TiKV Client Route Info ● Meta data management ● Load balance management TiKV - Multi-Raft Multiple raft groups in the cluster, one group for each region. Client

brian.ruth@garmin.comAn Introduction struct region { int size; }; void init_region(char* backing_buffer, size_t buffer_size ) { if(buffer_size < current_region.size) { LOG(“Buffer size too small”); return; //other init code }An Introduction struct region { int size; }; void init_region(char* backing_buffer, size_t buffer_size ) { if(buffer_size < current_region.size) { LOG(“Buffer size too small”); return; //other init code }An Introduction struct region { int size; }; void init_region(char* backing_buffer, size_t buffer_size ) { if(buffer_size < (size_t)current_region.size) { LOG(“Buffer size too small”);

对失败设计，沉淀了非常多的经验。 全局高可用 Nacos 部署架构上是单 Region 封闭，Region 间独立，跨 Region 通过网关或者 Nacos-sync 完 成服务互通。从而降低 Region 间网络故障风险。 当然用户也可以跨 Region 组 Nacos 集群，但是这样会带来服务跨 Region 互调，真正发生网络 故障的时候，无法控制业务影响。 因此不推荐此模式。 101 101 > Nacos 架构 同城容灾 Nacos 本身是采用 AP 的⼀致性模式，同 Region 多个可用区部署，任何⼀个可用区出问题，剩下 部分继续工作。 很多人问为什么不是三个可用区呢？ 因为业务都部署三个可用区从理论上是可用性最好的，但是成 本会大幅增加，因此⼀般公司只选择两个可用区。 数据多级容灾 Nacos 持久化存储做了主备容灾，而且底层存储数据多副本高可用保障。 Nacos CMDB 打通做 封网 APP（程序和 负责人） 子账号（程序账号和人账号） Dauth 应用账 号 普通账号+角色 环境 namespace 同左 同左 资源 acs:config:region:namespace:group 同左 同左 方案 Nacos 资源模型 105 > Nacos 架构 Nacos 授权 resource namespace+group+dataId

(Chunks) malloc Arena: a structure that is shared among one or more threads Heap: a contiguous region of memory subdivided into chunks Chunk: a range of memory of various sizes allocated to the applicationHow Arena malloc Arena: a structure that is shared among one or more threads Heap: a contiguous region of memory subdivided into chunks Chunk: a range of memory of various sizes allocated to the applicationHow Arena #2 malloc Arena: a structure that is shared among one or more threads Heap: a contiguous region of memory subdivided into chunks Chunk: a range of memory of various sizes allocated to the applicationHow

an A e an AWS Client VPN Endpoint WS Client VPN Endpoint 1. Open the Amazon VPC console in an AWS Region of your choice. 2. On the left-hand side navigation, select Client VPN Endpoint Client VPN Endpointss Organization • ID • Name • Display name • Avatar • User type • Password • Email • Phone • Country/Region • Location • Affiliation • Title • Homepage • Bio • Tag • Signup application • 3rd-party in ormation in Amaz Amazon on There are four required fields: Access Key , Secret Access Key , Region , and Template code . I will show you how to obtain this information from Amazon SNS. • Access

period, 1442", "region" : "Yamaguchi, Yamaguchi", "position" : "34.190181,131.472917" }, { "name" : "Founder's Hall", "temple" : "Eih¯o-ji", "founded" : "early Muromachi period", "region" : "Tajimi, Kamakura period", "region" : "K¯oya, Wakayama", "position" : "34.213103,135.580397" }, { "name" : "Goeid¯o", "temple" : "Nishi Honganji", "founded" : "Edo period, 1636", "region" : "Kyoto", "position" 751689" }, { "name" : "Golden Hall", "temple" : "Mur¯o-ji", "founded" : "early Heian period", "region" : "Uda, Nara", "position" : "34.536586819357986,136.0395548452301" }, (continues on next page)

Reformat Errors*"))) (setq max-mini-window-height 1) (if (= 0 (shell-command-on-region (point-min) (point-max) "gofmt" "*Go Reformat Output*" nil "*Go Refor mat Errors*" t)) (progn "run gofix on current buffer" (interactive) (show-all) (shell-command-on-region (point-min) (point-max) "go tool fix -diff")) 6. Congratulations, you're done! Speedbar is closed we don't want to have to manually modify our application's source code to cater to every possible region out there. When an application needs to add support for a new language, we should be able to simply

into regions - process as separate tasks Changing one region should not affect others Some tasks will take longer - more data to process in region Hope all jobs are similar in size If not then small jobs requires having quick access to static world data Many regions of the world - many tasks for each region Need to prevent everyone from duplicating work - and code ▶ Traditionally use one of tree structures Different arrays are useful for different queries Items which belong to a region - use owned nodes Items which influence / intersect a region - use intersecting nodes Speaker notesGRID NODE CLASS • Actually

lock_data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 813 54.19.42 lock_linear_region . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 813 54.19.43 map_device_in_memory_block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 815 54.19.48 request_linear_region . . . . . . . . . . . . . . . . . . . . . . . . . . . . 816 54.19.49 segment_to_descriptor . . unlock_data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 824 54.19.67 unlock_linear_region . . . . . . . . . . . . . . . . . . . . . . . . . . . . 825 54.20 tdpmiversioninfo . . . . . .