[Dovecot] How to get rid of locks
Miquel van Smoorenburg
miquels at cistron.nl
Sun Apr 8 12:41:43 EEST 2007
On Sat, 2007-04-07 at 22:30 +0300, Timo Sirainen wrote:
> Although Dovecot is already read-lockless and it uses only short-
> lived write locks, it's be really nice to just get rid of the locking
> completely. :)
> I just figured out that O_APPEND is pretty great. If the operating
> system updates seek position after writing to a file opened with
> O_APPEND, writes to Dovecot's transaction log file can be made
Doest his mean there's even less chance of indexes working on NFS (where
O_APPEND doesn't really work) ?
That's a pity, as a lot of larger sites use NFS. They are already forced
to use indexes on local disk - and dovecot seems to rely on indexes more
and more (fulltext index, shared mailboxes, etc).
And mailbox formats like dbox don't even work without an index.
I had hoped that the existing index code would be made more reliable and
network-filesystem safe first.
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