[Dovecot] Problems with quota dict in 1.1.alpha4

[arvids]

Hello,

there are problems with quota dict when multiple dovecot deliver processes are 
launched in parallel. It can be reproduced by sending a mail with multiple 
different recipients - the mail is delivered OK to all recipients, but the 
quota are not updated correctly in sql. I looked at the code and it seems 
that the problem is somewhere in dict cache.
If I configure in Postfix max number of deliver processes to 1, dict quota is 
updated correctly.

postconf -n output:
# 1.1.alpha4: /usr/local/dovecot/etc/dovecot.conf
base_dir: /var/run/dovecot/
syslog_facility: local0
protocols: pop3
ssl_disable: yes
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable: /usr/local/dovecot/libexec/dovecot/pop3-login
login_greeting: Server.
login_process_per_connection: no
login_process_size: 64
verbose_proctitle: yes
first_valid_uid: 95
first_valid_gid: 95
mail_uid: 95
mail_gid: 95
mail_location: maildir:~/Maildir
mail_debug: yes
fsync_disable: yes
mail_executable: /usr/local/dovecot/libexec/dovecot/pop3
mail_plugins: quota
mail_plugin_dir: /usr/local/dovecot/lib/dovecot/pop3
pop3_enable_last: yes
pop3_client_workarounds: outlook-no-nuls oe-ns-eoh
auth default:
  mechanisms: plain login digest-md5 cram-md5 apop
  cache_size: 2048
  cache_ttl: 28800
  cache_negative_ttl: 60
  user: doveauth
  verbose: yes
  debug: yes
  debug_passwords: yes
  passdb:
    driver: sql
    args: /usr/local/dovecot/etc/dovecot-sql.conf
  userdb:
    driver: prefetch
  userdb:
    driver: sql
    args: /usr/local/dovecot/etc/dovecot-sql.conf
  socket:
    type: listen
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
      user: vmail
      group: vmail
plugin:
  quota: dict:::proxy:/var/run/dovecot/dict-server:quotadict
dict:
  quotadict: mysql:/usr/local/dovecot/etc/dovecot-sql-dict-quota.conf


Regards, Arvids