From:	Malte S. Stretz	Date:	Wed Jan  3 08:28:08 2007
Subject:	Re: [PATCH] Advanced tagging and filtering

On Wednesday 03 January 2007 13:02 CET Justin Mason wrote:
> hi Malte!
>
> Thanks for this, it looks very useful indeed.  One tweak, though:
> > b)  Makes the TAG part of the filename configurable.  Ah, yeah, TAG was
> > called HASH before :)  I added the parameters tag (static tag), tag_sub
> > (callback to generate a dynamic tag) and two more (tag_max_length and
> > tag_warn, cf. inline doc).
>
> I would prefer to *add* the TAG part *as well as* the HASH stuff.
> The hash is useful, since it avoids collisions -- TAG doesn't make
> that guarantee (nor should it have to).
>
> That should be OK, right?

Yeah, that was my original plan.  But I wanted to keep the filename format 
backwards compatible.  Not sure if thats really needed, I also wasn't sure 
if I should add the tag in the front, the end or in between.  In the end I 
went for compatibility and assumed that in most cases the tags will still 
be quite unique -- at least in the producer/consumer case where you've got 
most probably some kind of pid in there they will be at least as unique as 
the current hostname/pid based ones.  And if not, we've got the timestamp 
plus the additional really random part at the end :)

Actually, when people start to filter the files based on their name, the 
format must not change anymore in future.  Maybe the filter should apply to 
the tag only...

Cheers,
Malte