Re: Cache and Store

On Thursday 10 May 2007 21:38, Bob Ham wrote:
> On Thu, 2007-05-10 at 00:36 +0100, Matthew Toseland wrote:
> > On Wednesday 09 May 2007 20:28, Bob Ham wrote:
> > > That was what I proposed near the start of this thread.  I would note,
> > > as well, that the store-shrinking code should already exist for cases
> > > when the user reduces the configured size of the store.
> >
> > It does, but as I have already stated at least once, it is difficult to
> > efficiently do an online shrink while preserving the most recently used
> > data.
> >
> > It is of course possible. One way to do it is to swap the key you'd be
> > deleting with the least recently used key just before truncating.
>
> What's your point?

The point is that as presently implemented we have two ways to shrink a store:
- Online, fast, doesn't preserve most valuable data.
- Offline, slow, does preserve most valuable data.

Obviously the latter is preferred but we can only do it on startup.

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