On 2012-10-25 23:18, Stan Hoeppner wrote:
On 10/25/2012 12:38 PM, Robert JR wrote:
On 2012-10-25 21:23, Stan Hoeppner wrote:
On 10/25/2012 1:00 PM, Stan Hoeppner wrote:
Switch Postfix to use the Dovecot Local Deliver Agent (LDA) in
place of the Postfix local/virtual delivery agent. Using Dovecot
LDA eliminates the file locking issue. Thus it also increases
throughput as lock latency is eliminated. It also enables using
all
the Dovecot delivery plugins such as Sieve, Quota, anti-spam, etc.
I forgot to mention one very important feature of Dovecot LDA: New
messages delivered by Postfix are indexed by LDA as they are
written
to the mailbox, flags updated at this time, etc. Thus when a
mailbox
is opened in an IMAP MUA, new messages are displayed instantly (I
don't use POP but it's probably faster as well). With your current
setup it can take from a few to many seconds to show new mail,
depending on message count. With LDA new message count seems to
have
no impact on the speed of display.
Thanks stan very much for your detailed answer, i will read about
LDA
to know how it works. But i still wonder why this mailbox locking
issue
and I hope for my referece some one at this form explain to me the
issue reason. as since postfix,dovecot has the same lockign settings
so
why this issue happen ? I have spend 3 days searching for an answer
and
i couldnot find any.. I think only Timo can answer my question...
I chose to focus on the permanent and proper solution, which is
eliminating your lock contention altogether and enabling maximum
performance and features.
Learning about file locking problems between applications may be a
noble
endeavor, but at this point it's simply a waste of your time. A
gazillion papers have been written about this subject over the years.
If you're that interested hunt them down and read them. I'm sure
Google
can find 1000 of them quickly. You'll be looking for academic papers,
not forum posts.
Thanks again stan
You're welcome.
Thanks again Stan, you are very helpfull, i will start learning how to
configure LDA, but hopefully i can also have an answer from Timo about
why this issue happened.. i am sure he is aware of it and can explain
it..
