On 1/22/15 10:05 PM, Stephen Frost wrote: >> In addition, there is a possible race condition in rsync where a file >> that is modified in the same second after rsync starts to copy will not >> be picked up in a subsequent rsync unless --checksum is used. This is >> fairly easy to prove and is shown here: >> >> https://github.com/pgmasters/backrest/blob/dev/test/lib/BackRestTest/BackupTest.pm#L1667 > Right, though that isn't really an issue in this specific case- we're > talking about post-pg_upgrade but before the upgraded cluster has > actually been started, so nothing should be modifying these files.
Indeed. This was really directed more at what Bruce said:
I am thinking the fix for standys would be similar to what we recommand
for upgrades with link mode using a rsync-created copy, e.g. use rsync
while the master is running to create a copy of the standby, then shut
down the master and run rsync again. However, at that point, you might
as well just take a base backup and be done with it.
--
- David Steele
da...@pgmasters.net
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