Le ven. 21 mai 2021 à 05:43, Amit Kapila <amit.kapil...@gmail.com> a écrit :
> On Fri, May 21, 2021 at 1:30 AM Guillaume Lelarge > <guilla...@lelarge.info> wrote: > > > > > >> If so, the > >> problem might be that copying the data of the first table creates a > >> transaction which blocks creation of the slot for second table copy. > > > > > > I don't understand how a transaction could block the creation of a slot. > Could you explain that to me? > > > > During the creation of the slot During the creation of the slot or during the creation of the subscription? because, in my tests, I create the slot before creating the snapshot. > , we need to build the initial snapshot > which is used for decoding WAL. Now, to build the initial snapshot, we > wait for all running xacts to finish. See functions > CreateReplicationSlot() and SnapBuildFindSnapshot(). > > If we have two workers, both will have a snapshot? they don't share the same snapshot? And if all this is true, I don't see how it could work when the replication happens between two clusters, and couldn't work when it happens with only one cluster. -- Guillaume.
