Hi,
I wonder can we set up a hot standby in such a way that we don't need
any log streaming nor shipping, where instead every hot standby just
mounts the same disk in read-only mode which the master uses to write
his WAL files?
Even without a clustered file system, e.g., a UFS on FreeBSD, one can
have the master mount in read-write mode while all the hot standbys
would mount the volume read-only. Given that WAL logs are written out at
a certain rate, one can at regular intervals issue
mount -u /pg_wal
and it should refresh the metadata, I assume. I am re-reading about
hot-standby, and it strikes me that this method is essentially the "log
shipping" method only that there is no actual "shipping" involved, the
new log files simply appear all of a sudden on the disk.
I suppose there is a question how we know when a new WAL file is
finished appearing? And as I read the log-shipping method may not be
suitable for hot standby use?
Is this something that has been written about already?
regards,
-Gunther
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