Re: Synchronous Log Shipping Replication - Mailing list pgsql-hackers

From Markus Wanner
Subject Re: Synchronous Log Shipping Replication
Date
Msg-id 48C5AC92.20800@bluegap.ch
Whole thread Raw
In response to Re: Synchronous Log Shipping Replication  (Bruce Momjian <bruce@momjian.us>)
Responses Re: Synchronous Log Shipping Replication  (Bruce Momjian <bruce@momjian.us>)
List pgsql-hackers
Hi,

Bruce Momjian wrote:
> Backends would
> update a shared memory variable specifying how far they want the wal
> streamer to advance and send a signal to the wal streamer if necessary. 
> Backends would monitor another shared memory variable that specifies how
> far the wal streamer has advanced.

That sounds like WAL needs to be written to disk, before it can be sent 
to the standby. Except maybe with some sort of mmap'ing the WAL.

Regards

Markus Wanner



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