分片扩容方案

分片扩容方案
1.1 分片扩容介绍
1.1.1 执行逻辑
分片扩容为Gbase8a 8611以上版本独有功能，可以做到按全库全表、单库、单表来操作，其实无论任务的下发为何种情况，在UP/8a集群看来均使用表级来操作，减少扩容时的差错。其实现方式为，在Gbase 8a 8611 以上版本时，Gbase table distribution 表新增一列用于标识表所使用的distribution ID，在扩容过程中，目标表会依据新distribution重建，在扩容过程中，会优先选取效率高的数据同步方式即若分片拷贝可达到效果则会舍弃重分布直接使用分片拷贝。在扩容过程中，可不停止业务，仅会对原表加有select锁，阻碍ddl操作，若表数据量不大，则影响时间可忽略。
1.1.2 执行步骤
Gbase 8a/UP 产品分片扩容较为简单，一般可分为如下步骤:
(1) 规划创建新的distribution用于数据分布并进行初始化。
(2)在UP/8a集群，执行扩容命令，发起扩容操作，进行数据重分布。
(3)待分布完成后，将原distribution删除。
1.2 扩容主体规划
在进行扩容之前，分布结构和重分布优先级需要进行规划，介绍如下：
1.2.1 新分布结构选取

1. 主分片数目选取
   GbaseUP支持与8611版本相同的多分片模式，弱化逻辑分片与物理分片的对应关系，一个物理分片可对应一至多个逻辑分片，随着每个物理分片对应逻辑分片的个数的提升，单节点CPU、IO会上升，集群处理效率会略微下降，但木桶效应会下降。所以推荐UP在升级后选取两分片作为需使用的分片数目。
2. 备分片数目选取
   多副本是Gbase UP/8a集群确保高可用的一项举措，副本数据维持跟主本数据完全一致，且自动维护。在主片数据不可用时，集群会自动切换至副本，保证高可用机制，在出现节点损坏情况下，也可通过备片数据恢复主片数据。但随着副本数目的增多，会带来存储占用过多和执行效率下降的问题，对于此次升级我们建议选取一个副本。
3. 生成模式选取
   GbaseUP的生成模式方式也与8611相同支持两种，在生成模式中，引入机架的概念。在第一种备份模式中，每一个机架上分片的第一个备份分片会放置于上一个机架上，第二个备份分片则放置于下一个机架上。在第二种备份方式则为每一台服务器的第一个备份分片放置于上一台服务器，而第二个备份分片则放置于下一台服务器。由于此机架概念也为虚拟概念，通过合理的配置均可做到使得每个分片及其备份分片放置于不同的物理机架上，达到预防物理机架灾难的效果。但鉴于分片IP的易于读取和易于理解，推荐选取备份模式1。

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