something always use. Aaaa
⇑
Bbbb
⇓
bb
cc
1 # nysync
| A | B | nsync(B) | nydbc(B) |
|---|---|---|---|
| 1,0 | - | - | - |
| - | 1,0 | - | - |
| - | - | call(1,0)[nysync] | - |
| now A&B update the same row at the same time | - | - | - |
| 2,0 | - | - | - |
| - | 2,0 | - | - |
| - | - | - | 2,1[nydbc] |
| - | - | - | call(2,1)[nydbc] |
| - | - | call(2,0)[nysync] | - |