On Wed, Jun 5, 2013 at 1:30 AM, Albe Laurenz <laurenz.albe@xxxxxxxxxx> wrote:
>> I have a question about sync streaming replication.I think you misunderstood - he restores a dump on
>>
>> 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.
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.
Cheers,
Jeff
