yes, as you said, It's my fault that I haven't add any node to set.

now, I have do that, but, when merge, I got:
<stdin>:13: Subscription set 2 created
<stdin>:15: Adding tables to subscription set
<stdin>:26: Subscribe created
<stdin>:28: PGRES_FATAL_ERROR select "_replication".mergeSet(1, 2);  -
ERROR:  Slony-I: set 2 has subscriptions in progress - cannot merge


should I stop all the slon process???

thanks:D

regards,
On Thu, 2008-07-31 at 22:30 -0700, Jeff Frost wrote:
> On Fri, 1 Aug 2008, Yi Zhao wrote:
> 
> > when I merge: I got,
> >
> > <stdin>:13: Subscription set 2 created
> > <stdin>:14: Adding tables to subscription set
> > <stdin>:18: PGRES_FATAL_ERROR select "_replication".mergeSet(1, 2);  -
> > ERROR:  Slony-I: subscriber lists of set 1 and 2 are different
> 
> Looks like you didn't subscribe any nodes to set 2.  Set 2 has to have 
> identical subscriptions to set 1 before it can merge with set 1.
>