On 31 July 2014 07:45, Michael Paquier <michael.paqu...@gmail.com> wrote:
>> So I don't see the need for two full page images. > By doing so you definitely need an additional mode for full-page > writes: one certifying that process does not apply this FPW because it > wants to compare it to current page after applying the WALs. This > increases the footprint of the feature on code because all the code > paths where RestoreBackupBlock is called need to be bypassed. Yeh, it looks like you need to do CheckBackupBlock() exactly as many times as you do RestoreBackupBlock(), with the sequence of actions being RestoreBackupBlock(), apply WAL then CheckBackupBlock(). That will work without much code churn, it will be just a one line addition in a few dozen places. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
