Lazy opening of cyrus.cache file

[David Carter]

On Tue, 24 Mar 2009, Bron Gondwana wrote:

> Only very lightly tested... but hey.
>
> Don't open the cyrus.cache file unless you need to,
> handy for those people running with small fast meta
> partitions and slow big partitions with the
> cyrus.cache on them :)

Curiously I was having similar thoughts after laying my grubby paws on a 
pair of Intel X25e SSDs last week.

What are you doing about the generation numbers in the cyrus.index and 
cyrus.cache file?

There is a fairly elaborate dance in mailbox_open_index() to make sure 
that the correct pair of files are open in the face of mailbox_expunge() 
renaming two files in rapid succession in immediate or cleanup mode.

-- 
David Carter                             Email: David.Carter at ucs.cam.ac.uk
University Computing Service,            Phone: (01223) 334502
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