how is data changes handled during initial data synchronization?

[carolfly86]

We aim to do online upgrade from 9.4 to 9.5 with pglogical. Our tables are quite large (37GB), and take over 1hr to synchronize with SELECT pglogical.replication_set_add_all_tables('default', ARRAY['public'], true);

Will the data changes made during the synchronize process be missing from subscriber? If it is, is there a way to ensure those changes are carried over to subscriber?

[ringerc]

It's handled automatically by the snapshot exported during replication slot creation, so long as you get pglogical to handle schema and data sync.

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