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snowflake's Introduction

SNOWFLAKE

Build Status

设计理念

  1. 分布式uuid发生器，twitter snowflake的go语言版本
  2. 序列发生器

uuid格式为:

+-------------------------------------------------------------------------------------------------+
| UNUSED(1BIT) |         TIMESTAMP(41BIT)           |  MACHINE-ID(10BIT)  |   SERIAL-NO(12BIT)    |
+-------------------------------------------------------------------------------------------------+

安装

默认情况下uuid发生器依赖的snowflake-uuid键值对必须预先在etcd中创建，snowflake启动的时候会读取，例如：

   curl http://172.17.42.1:2379/v2/keys/seqs/snowflake-uuid -XPUT -d value="0"

这个snowflake-uuid会用于MACHINE-ID的自动生成，如果完全由用户自定义machine_id，可以通过环境变量指定，如:

   export MACHINE_ID=123

如果要使用序列发生器Next()，必须预先创建一个key，例如:

   curl http://172.17.42.1:2379/v2/keys/seqs/userid -XPUT -d value="0"

其他部分参考Dockerfile

使用

snowflake 参考测试用例和snowflake.proto

环境变量

ETCD_HOST: eg: http://172.17.42.1:2379
MACHINE_ID: eg: 123

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