Environment : postgres 8.4, slony 1.2.20
When adding a new node to an existing replication environment its my
understanding that you would first get the slon process running on the new
node. Even without subscribing sets the slon process on the new node would need
to be running in order to handle events, correct? Otherwise, the sl_status
st_lag_time for this new node would report a larger and larger lag time, right?
I'm asking because someone that I know suggested that you could add a node and
subscribe it a couple weeks later and it wouldn't effect replication at all in
that interim period. I said that it wouldn't change replication to the existing
nodes but that the new node would possibly trigger alarms if they were based on
st_lag_time. Even though a new node isn't subscribed it still must handle
ongoing events, right? Even if the handling is to discard them? That is, the
master sends out events to all slaves and how they process them is decided on
the slave slon process - the master doesn't filter things to send different
events out to different nodes based on their subscription.
Thanks,
Frank
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