Re: [kde] about akonadi
- From: Kevin Krammer <kevin.krammer@xxxxxx>
- Date: Wed, 24 Mar 2010 21:53:44 +0100
On Wednesday, 2010-03-24, Duncan wrote:
FWIW, there's a LOT of folks who disagree with the use of akonadi and its
database backend for something as critical as mail. There's a huge risk
of kde/kmail developing the reputation of eating people's mail for lunch,
if this isn't handled well -- and arguably even if it is. There's a
reason kde continues to rely on text based config files, even if human-
opaque binary formats such as the MS Windows registry are more efficient.
FWIW, that's at least one of the tasks kded is responsible for, keeping
the text based config files in sync with the binary "ksycoca" (kde system
config cache). Many a sysadmin has had to become familiar with the
kbuildsycoca/kbuildsycoca4 command to rebuild their broken kde, over the
years, but the existence of that binary ksycoca cache does keep kde
responsiveness up to par, while the continued existence of the text based
config files do help to keep kde humanly configurable, should things go
wrong.
I don't know whether kmail's going to do something similar, keep its
maildir and mbox mail files and only use akonadi as a binary based data
cache, or if it's killing the mbox and maildir formatted messages entirely
for "internal" use, but I do hope it's the former, as I'm certainly not
alone in fearing for the stability and ultimate manual editability of my
mail store, should it be necessary, if they're switching entirely to
binary database, not just using it as a binary data cache.
One of the common misunderstandings around Akonadi is that the relational
database is used for storage.
Probably introduced by focusing too much on the database part than on the
relational part.
Akonadi, or more specifically the Akonadi server, is a proxy. Interestingly
caching proxies in other domains such as web browsing are understood in terms
of their functionality and not their implementation details.
Maybe it is because a web proxy usually only works one-way while Akonadi works
bidirectional or because people have difficulties understanding that mail
servers are also "on the Internet" or because people don't care if PIM data is
transferred repeatedly and at network speed rather than local speed.
Whatever the reason, it is still just a proxy.
One that works into both directions and can notify clients about changes
rather than having them regularily reload the things they are interested in.
Cheers,
Kevin
--
Kevin Krammer, KDE developer, xdg-utils developer
KDE user support, developer mentoring
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