Re: Streaming replication status

On Thu, 2010-01-14 at 23:07 -0500, Greg Smith wrote:

> pg_last_archived_xlogfile() text:  Get the name of the last file the
> archive_command [tried to|successfully] archived since the server was
> started.  If archiving is disabled or no xlog files have become ready
> to archive since startup, a blank line will be returned.  

OK

> It is possible for this function to return a result that does not
> reflect an actual xlogfile if files are manually added to the server's
> archive_status directory.

> I'd find this extremely handy as a hook for monitoring scripts that
> want to watch the server but don't have access to the filesystem
> directly, even given those limitations.  I'd prefer to have the "tried
> to" version, because it will populate with the name of the troublesome
> file it's stuck on even if archiving never gets its first segment
> delivered.
> 
> I'd happily write a patch to handle all that if I thought it would be
> accepted.  I fear that the whole approach will be considered a bit too
> hackish and get rejected on that basis though.  Not really sure of a
> "right" way to handle this though.  Anything better is going to be
> more complicated because it requires passing more information into the
> archiver, with little gain for that work beyond improving the quality
> of this diagnostic routine.  And I think most people would find what I
> described above useful enough.

Yes, please write it. It's separate from SR, so will not interfere.

-- 
 Simon Riggs           www.2ndQuadrant.com