Re: Postgres Hot Standby. How or when does the recovery db move recovery.conf to recovery.done? - Mailing list pgsql-general

From one of Tom's reply to a different poster, I found that one can run

pg_resetxlog. http://www.postgresql.org/docs/8.2/static/app-pgresetxlog.html,
to make the db recover and startup.

Appears not for the faint hearted!

Dhaval

On 3/21/07, Dhaval Shah <dhaval.shah.m@gmail.com> wrote:
> I looked at the pg_standby utility and would have liked to use it,
> however there are some customer driven extraneous issues in using
> that.
>
> What I am looking at it is this:
>
> 1. I can detect that the primary has gone down and return a non-zero
> for the standby to recover.
>
> 2. Since I can detect that I am out of standby mode, I can shutdown
> the postgres, move the recovery.conf file to recovery.done manually.
> And then restart the db.
>
> Even if I do step 2, I still get the following in the server log:
>
> =====
> Main: Triggering Recovery!!!  <- my script is returning a non-zero code here ...
>
> PANIC:  could not open file "pg_xlog/00000001000000000000001B" (log
> file 0, segment 27): No such file or directory
> LOG:  startup process (PID 32167) was terminated by signal 6
> LOG:  aborting startup due to startup process failure
> LOG:  database system was interrupted while in recovery at log time
> 2007-03-20 13:04:28 PDT
> HINT:  If this has occurred more than once some data may be corrupted
> and you may need to choose an earlier recovery target.
> LOG:  could not open file "pg_xlog/000000010000000000000006" (log file
> 0, segment 6): No such file or directory
> LOG:  invalid primary checkpoint record
> LOG:  could not open file "pg_xlog/000000010000000000000005" (log file
> 0, segment 5): No such file or directory
> LOG:  invalid secondary checkpoint record
> PANIC:  could not locate a valid checkpoint record
> LOG:  startup process (PID 4676) was terminated by signal 6
> LOG:  aborting startup due to startup process failure
> LOG:  database system was interrupted while in recovery at log time
> 2007-03-20 13:04:28 PDT
> ====
>
> The question I have is how do I get out of the above mode and ensure
> that the db is up and ready? What I need to clear? A previous cache or
> something? Am I missing something here? I went to the docs and it says
> the following:
>
> "Start the postmaster. The postmaster will go into recovery mode and
> proceed to read through the archived WAL files it needs. Upon
> completion of the recovery process, the postmaster will rename
> recovery.conf to recovery.done (to prevent accidentally re-entering
> recovery mode in case of a crash later) and then commence normal
> database operations."
>
> And I do not see the recovery.conf go to recovery.done automatically.
>
> Dhaval
>
>
> On 3/21/07, Merlin Moncure <mmoncure@gmail.com> wrote:
> > On 3/21/07, Dhaval Shah <dhaval.shah.m@gmail.com> wrote:
> > > Resending.
> > >
> > > I have a "hot" standby. Now, if the primary fails
> > > how do I tell the secondary that come out of recovery mode and move
> > > the recovery.conf to recovery.done and start the db. I mean, what
> > > error code shall I return?
> >
> > did you look at pg_standby utility? it has kill file mechanism that
> > automates this for you.
> >
> > merlin
> >
>
>
> --
> Dhaval Shah
>


--
Dhaval Shah