[RFC] Loggerhead's caching architecture

[John Arbash Meinel]

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Ian Clatworthy wrote:
> John,
> 
> I've been pondering our (phone) discussion re caching in Loggerhead
> today. I agree that we ought to use history-db where we can rather than
> maintain custom caching inside loggerhead.
> 
> Here as the choices as I understand them.
> 
> 1. Making history-db completely optional. If's it there and configured,
> use it for caching, otherwise don't.
> 
> 2. Make history-db mandatory but make the disk cache optional.
> 
> 3. Make history-db mandatory and require the disk cache to be configured.


So I've been thinking about this some more, and I wanted to point out
that *today* the disk cache is not optional. Specifically, if
http_sql_dir has not been configured SQL_DIR is set to a temp directory
(which isn't cleaned up when the process exits...)

So making the disk cache mandatory isn't a big overhead over the
existing code...

John
=:->
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