On Wednesday, September 10 at 07:50 PM, quoth Steinar
Bang:> Gnus use a lot of custom flags to represent the messages state
> wrt. Gnus.
>
> How well are these flags supported in dovecot? How fast are access to
> them? (Ie. will dovecot have to open the message and parse the headers)
The flag information is stored in the index, and for Maildir backends
the first 26 flags are stored in the filename as well. In other words,
access to flags is pretty dang fast, and for Maildir storage, never
requires opening the message or parsing headers.
When you use mbox, though, the keywords are stored in the message's
headers (X-IMAPbase), so parsing the headers is sometimes necessary.
HOWEVER, Dovecot adaptively chooses what message information to keep
in the index and cache. If a user is using Gnus, those keywords will
end up in the mailbox cache, and generally won't need to be read from
the message file.
Large numbers of keywords (esp. more than 26), though, hasn't been
tested a whole lot, but should be reasonably fast (largely because of
the index and cache files). Timo talked about this a few months ago
and if I remember right he indicated that there were some
inefficiencies in dealing with really large numbers of keywords, but
since they're so rarely used in any significant volume, improving that
component was a low priority.
~Kyle
--
The optimist thinks this is the best of all possible worlds. The
pessimist fears it is true.
-- J. Robert Oppenheimer
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