>> I have a question about sync streaming replication. >> >> I have 2 postgresql 9.1 servers set up with streaming replication. On the >> master node the slave is configured as a synchronous standby. I've verified >> that pg_stat_replication shows sync_state = sync for the slave node. >> >> It all seems to work fine. But I have noticed that sometimes when I restore >> backups created by pg_dump. The slave node will disconnect with the message >> in the postgresql log: > > You cannot use pg_dump to set up a database for receiving streaming replication. > > For that it must be a physical copy, not a logical copy which is what pg_dump generates.
I think you misunderstood - he restores a dump on the *primary* and that makes replication fall over because it cannot catch up.
Ah, I see. And the synchronization point doesn't help, because it only occurs at commit-time and if the dump is being loaded in a single transaction, then the transaction could last for several checkpoints. By the time it tries to synchronize, it is already too late.
