>> I can't find any doc's on what happens to replication data collected by
>> triggers -
>>
>> 1) when will it be deleted (both on master and on replicating slaves)
>> 2) in what cases is it kept on slave side
>
> Loosely speaking, it is deleted until it is not needed anymore by any of
> the subscribers for a given node.

So there will be relatively little overhead little overhead if I SUBSCRIBE
SET with FORWARD=YES even if not planning to start replicating from it
immediately ?

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Hannu