PostgreSQL/PolarDB集群统一管理、统一运 维。  PostgreSQL/PolarDB集群可以用功能（即故 障自动切换）  实现对PostgreSQL/PolarDB的监控管理  对PostgreSQL/PolarDB的TopSQL的管理  架构说明  有一台机器上部署的CLup管理节点，这个管 理节点提供WEB管理界面统一管理所有的 PostgreSQL/PolarDB数据库。

object唯一标识。© XXX Page 3 of 11 整体思路 curvefs对接s3和对接volume主要的区别在于数据持久化和空间分配部分，而元数据的操作尽量保持统一。因此我们涉及到修改client的流程主要在read/write/flush，以及空间分配申请（s3不需要释放空间，可 直接删除对应s3 object） 文件首先会按照chunk进行 S3Info进行了合并，后面需要考虑如果S3Info太大，需要进行rewrite将元数据进行重新合并 4.inode我们只更新s3Info，并不更新length，length由client在外面流程统一更新© XXX Page 11 of 11 read流程 1.read流程的难点在于，inode中存在的S3ChunkInfo情况的多样性，因此在read前，需要先对s3info信息进行优化，将

云原生 设计目标Curve文件存储 1. 兼顾性能与容量的机器学习 场景 2. 快速跨云弹性发布的业务 3. 低成本大容量需求的业务 4. 中间件冷热数据自动分离 5. S3和POSIX统一访问需求 主要挑战和支持场景Curve Roadmap 1. 架构 1. 文件存储支持分布式缓存、完善冷热数据分层存储能力 2. 完善混合云、公有云上部署架构 3. 完善高性能3副本存储引擎，支持混合盘

Chunkserver: 用于抽象描述物理服务器上的一块物理磁盘 (SSD)，chunkserver以一块磁盘作为最小的服务单元。TOPOLOGY curve在上物理pool之上又引入逻辑pool的概念，以实现统一存储系统的需求，即在单个存储系统中多副 本PageFile支持块设备、三副本AppendFile（待开发）支持在线对象存储、AppendECFile（待开发）支持 近线对象存储可以共存。 如上

expression :(1 == 1.0) is spliced into the test condition slot, while the value of string(:(1 == 1.0)) is spliced into the assertion message slot. The entire expression, thus constructed,CHAPTER 18. METAPROGRAMMING the namespace. import for only the module name is possible (roughly equivalent to ASDF:LOAD-OP). Slot names don't need to be exported separately. Global variables can't be assigned to from outside the find the - character. The y, m, and d characters let the parser know which periods to parse in each slot. As in the case of constructors above such as Date(2013), delimited DateFormats allow for missing

expression :(1 == 1.0) is spliced into the test condition slot, while the value of string(:(1 == 1.0)) is spliced into the assertion message slot. The entire expression, thus constructed,CHAPTER 18. METAPROGRAMMING the namespace. import for only the module name is possible (roughly equivalent to ASDF:LOAD-OP). Slot names don't need to be exported separately. Global variables can't be assigned to from outside the find the - character. The y, m, and d characters let the parser know which periods to parse in each slot. As in the case of constructors above such as Date(2013), delimited DateFormats allow for missing

expression :(1 == 1.0) is spliced into the test condition slot, while the value of string(:(1 == 1.0)) is spliced into the assertion message slot. The entire expression, thus constructed, is placed into the namespace. import for only the module name is possible (roughly equivalent to ASDF:LOAD-OP). Slot names don't need to be exported separately. Global variables can't be assigned to from outside the find the - character. The y, m, and d characters let the parser know which periods to parse in each slot. As in the case of constructors above such as Date(2013), delimited DateFormats allow for missing

expression :(1 == 1.0) is spliced into the test condition slot, while the value of string(:(1 == 1.0)) is spliced into the assertion message slot. The entire expression, thus constructed, is placed into the namespace. import for only the module name is possible (roughly equivalent to ASDF:LOAD-OP). Slot names don't need to be exported separately. Global variables can't be assigned to from outside the find the - character. The y, m, and d characters let the parser know which periods to parse in each slot. As in the case of constructors above such as Date(2013), delimited DateFormats allow for missing

expression :(1 == 1.0) is spliced into the test condition slot, while the value of string(:(1 == 1.0)) is spliced into the assertion message slot. The entire expression, thus constructed, is placed into the namespace. import for only the module name is possible (roughly equivalent to ASDF:LOAD-OP). Slot names don't need to be exported separately. Global variables can't be assigned to from outside the find the - character. The y, m, and d characters let the parser know which periods to parse in each slot. As in the case of constructors above such as Date(2013), delimited DateFormats allow for missing

expression :(1 == 1.0) is spliced into the test condition slot, while the value of string(:(1 == 1.0)) is spliced into the assertion message slot. The entire expression, thus constructed, is placed into the namespace. import for only the module name is possible (roughly equivalent to ASDF:LOAD-OP). Slot names don't need to be exported separately. Global variables can't be assigned to from outside the find the - character. The y, m, and d characters let the parser know which periods to parse in each slot. As in the case of constructors above such as Date(2013), delimited DateFormats allow for missing