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Merged
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Nov 21, 2020
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update #7

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a0f010a
Update 分布式id生成方案总结.md
IsCHANo Nov 20, 2020
1d9ea4e
Merge pull request #993 from shahainloong/master
Snailclimb Nov 20, 2020
71ed90c
Merge pull request #992 from IsCHANo/patch-1
Snailclimb Nov 20, 2020
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4 changes: 2 additions & 2 deletions docs/system-design/micro-service/分布式id生成方案总结.md
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Expand Up @@ -99,7 +99,7 @@ update id_generator set current_max_id=#{newMaxId}, version=version+1 where vers

因为newMaxId是DistributIdService中根据oldMaxId+步长算出来的，只要上面的update更新成功了就表示号段获取成功了。

为了提供数据库层的高可用，需要对数据库使用多主模式进行部署，对于每个数据库来说要保证生成的号段不重复，这就需要利用最开始的思路，再在刚刚的数据库表中增加起始值和步长，比如如果现在是两台Mysql，那么 mysql1将生成号段（1,1001]，自增的时候序列为1，3，4，5，7.... mysql1将生成号段（2,1002]，自增的时候序列为2，4，6，8，10...
为了提供数据库层的高可用，需要对数据库使用多主模式进行部署，对于每个数据库来说要保证生成的号段不重复，这就需要利用最开始的思路，再在刚刚的数据库表中增加起始值和步长，比如如果现在是两台Mysql，那么 mysql1将生成号段（1,1001]，自增的时候序列为1，3，5，7.... mysql1将生成号段（2,1002]，自增的时候序列为2，4，6，8，10...

更详细的可以参考滴滴开源的TinyId：[github.com/didi/tinyid…](https://github.com/didi/tinyid/wiki/tinyid原理介绍)

Expand Down Expand Up @@ -181,4 +181,4 @@ AOF持久化相当于对每条写命令进行持久化，如果Redis挂掉了，

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