On 19 Sep 2014, at 12:05, Dawid Stawiarski - nazwa.pl <dawid.stawiar...@netart.pl> wrote:
> we use dovecot 2.2.13, and we've lately started using maildir quota > (previously fs quota was used, right now it's "quota = maildir:User quota" > changed from "quota = fs:User quota:user:inode_per_mail"). > > When the change was applied we didn't manually forced generating maildirsize > files. So, when the first deliver happens (or the file grows larger then 5KB) > it starts quota recalc. However for users with big maildirs, receiving email > every couple of seconds, there are tens of delivery processes each doing its > own recalc (as they open file for APPEND and there's no locking). What's even > worse, after all the stats and getdents (it takes a lot of IO for 60GB > account with 2M emails), deliver makes stat on 'new' dir and detects changes > after which it unlinks freshly created maildirsize. So possibly this will > never be finished as every process drops its own work. > > The same thing happened when we checked the native dovecot LMTP server (every > connection has its own forked process - each running independently of the > others). > > Is it a known unwanted "feature" of maildir quota (and we should use dict > quota instead) or a bug that will be fixed? It's a feature that won't be changed. The stat()s are especially bad if you see them - they wouldn't happen if your Maildir filenames contain the ,S=size part. Switch to dict file, which won't be recalculated unless you manually do it.
