Second draft of logging patches

[Michal Sojka]

On Wed, 10 Nov 2010, David Bremner wrote:
> On Sun, 24 Oct 2010 18:01:02 -0300, david at tethera.net wrote:
> > Here is my second try at logging, taking into account the feedback I
> > got from Rob and Michal.  There is definitely some tidying to do; in
> > particular I know the protoypes in public headers need
> > documentation. Also, I should add a configuration option to
> > enable configuration by command or something like that.
> 
> I had a thought of a possibly interesting application of the (yet to be
> written) log playback code. It could be use to implement a simple
> queuing system where commands are only logged but not actually run on
> the database. I'm not sure about the performance implications, but it
> could be interesting because it eliminates the need to have a server
> running in order to eliminate write contention for the tag database.
> The "queue runner" could be as simple as a cron job, or it could be
> something spawned by one of the queue operations; the point would be
> that queueing could continue while the snapshot of the queue was run.

Hi, I think this could be very interesting and that it could make the
tagging operation asynchronous and thus faster as was suggested by
Sebastian in id:"87k4l5whwe.fsf at SSpaeth.de".

In this case, however, the queuing should happen in the client, not in
the library.

-Michal