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add diagram for dist id

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Xargin 2018-07-08 23:00:30 +08:00
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ch6-cloud/ch6-07-dist-id.md
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# 6.7. 分布式 id 生成器
```
datacenter_id sequence_id
unused
│ │
│ │ │
│ │ │
│ │ │ │ │
│ │ │ │ │
▼ │◀────────────────── 41 bits ────────────────────▶│ ▼ ▼
┌─────┼──────────────────────────────────────────────────────┼────────┬────────┬────────────────┐
│ 0 │ 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0 │ 00000 │ 00000 │ 0000 0000 0000 │
└─────┴──────────────────────────────────────────────────────┴────────┴────────┴────────────────┘
▲ ▲
│ │
│ │
│ │
│ │
│ │
│ │
time in milliseconds worker_id
```