Chris Redekop's recent report of slow startup for Hot Standby has made me revisit the code there.
Although there isn't a bug, there is a missed opportunity for starting up faster which could be the source of Chris' annoyance. The following patch allows a faster startup in some circumstances. The patch also alters the log levels for messages and gives a single simple message for this situation. The log will now say LOG: recovery snapshot waiting for non-overflowed snapshot or until oldest active xid on standby is at least %u (now %u) ...multiple times until snapshot non-overflowed or xid reached... whereas before the first LOG message shown was LOG: consistent state delayed because recovery snapshot incomplete and only later, at DEBUG2 do you see LOG: recovery snapshot waiting for %u oldest active xid on standby is %u ...multiple times until xid reached... Comments please. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services
faster_hot_standby_startup_withsubxacts.v1.patch
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