雪花算法（Snowflake）是一种分布式系统中生成唯一ID的算法，最初由Twitter提出。它可以在不依赖数据库的情况下生成全局唯一的ID。雪花算法生成的ID是一个64位的长整型数字，结构如下：
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| 41 | 0 | 1 |
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| 255 | 0 | 1 |
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雪花算法生成的ID是一个64位的长整型数字，其中包含以下部分：
- 1位符号位：始终为0，表示正数。
- 41位时间戳：表示当前时间与某个固定时间点的差值，单位为毫秒。这部分可以表示约69年的时间。
- 10位机器标识：用于标识不同的机器或节点，最多可以支持1024个节点。
- 12位序列号：在同一毫秒内，同一个节点可以生成的ID序列号，最多可以生成4096个。
雪花算法的优点是生成的ID全局唯一且趋势递增，适用于分布式系统中的唯一ID生成场景。
