Hi Haiyang,

> v6-0004 only skip the transaction commited during START state and precedeing 
> next_phase_at
> (set when changing to BUILDING_SNAPSHOT state) during BUILDING_SNAPSHOT. 
> Those transactions
> are always useless no matter in fast forward or not. Plaese recheck v6-0004 
> again.

Yeah, you're right. What's useful for building the snapshot and we currently 
don't track are the txns
start after BUILDING_SNAPSHOT and commit before FULL_SNAPSHOT, their xids all 
>= next_phase_at
during BUILDING_SNAPSHOT.

--
Regards,
ChangAo Chen

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