When using pg_standby to remain in recovery mode on a warm standby system, if there is a need to perform other actions in coordination with recovery actions, the -x <auxiliary command> option implemented by this patch enables that coordination. I considered adding the ability to override the restoreCommand, however by keeping this separate and optional it is possible to force retries of the auxiliary command until successful and still utilize pg_usleep instead of looping within an external script or command. And the previous behavior of pg_standby remains unchanged (other than debug logging and documenting the option in usage) if the new option is omitted.
I added this feature to help with synchronization of a content repository consisting of a PostgreSQL db for meta-information and a separate file store for content. The auxiliary command enables forcing an rsync of the file store that is at least as current as the found WAL segment file's db changes, and prevents recovery of that WAL file unless the rsync can be performed successfully. (See attached file: pg_standby.c.diff) Please consider incorporating this feature. Chris _____________________________________________ Christopher K. Johnson Director of IT DeskNet Inc. RHCE# 804005699817957 "A society grows great when old men plant trees whose shade they know they shall never sit in" - Greek Proverb
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