On Fri, Sep 18, 2015 at 12:34 PM, Michael Paquier <michael.paqu...@gmail.com> wrote: > On Fri, Sep 18, 2015 at 9:00 AM, Alexander Korotkov wrote: >> BTW, it would be an option to generate system_identifier to each new >> timeline, by analogy of initdb do for the whole WAL. >> Having such system_identifiers we can distinguish different timeline which >> have assigned same ids. >> Any thoughts? > > If you mean a new field incorporated in XLogLongPageHeader and > ControlFile to ensure that a new timeline generated is unique across > the same installation identified with system_identifier, then I'm not > against it for something up to 2 bytes (even 1 byte would be fine),
Er, 2 bytes may be a bad idea as well, 1/16k% chance of collision looks dangerous when rewinding a node... It could cause silent data corruption on the standby being rewounded. -- Michael -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
