dict lookup too long time

[hfh at cndns.com]

hi,

The following error message sometimes appears on my server log,it causes the mailbox to exceed the disk capacity limit.

May  9 09:54:11 imap dovecot: imap(hfh at cndns.com): Error: dict-client: Lookup 'priv/quota/storage' failed: Connection closed: read(size=8192) failed: Connection reset by peer (reply took 2.728 secs (2.729 in dict wait, 0.000 in other ioloops, 0.000 in locks))

dovecot -n

# 2.2.36 (1f10bfa63): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.24 (124e06aa)
# OS: Linux 2.6.32-504.el6.x86_64 x86_64 CentOS release 6.6 (Final) 
# Hostname: imap3bak.sh.chengmail.me
auth_master_user_separator = *
auth_mechanisms = PLAIN LOGIN
deliver_log_format = msgid=%m, subject=%s, from=%f, %$
dict {
  acl = mysql:/etc/dovecot/dovecot-share-folder.conf
  quotadict = mysql:/etc/dovecot/dovecot-used-quota.conf
}
disable_plaintext_auth = no
first_valid_uid = 2000
last_valid_uid = 2000
listen = *
mail_fsync = never
mail_gid = 2000
mail_location = maildir:/%Lh/Maildir/:INDEX=/%Lh/Maildir/
mail_plugins = quota lazy_expunge zlib
mail_uid = 2000
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext
mmap_disable = yes
namespace {
  list = children
  location = maildir:/%%Lh/Maildir/:INDEX=/%%Lh/Maildir/Shared/%%u
  prefix = Shared/%%u/
  separator = /
  subscriptions = yes
  type = shared
}
namespace {
  hidden = yes
  list = no
  location = maildir:/var/vmail/backup/expunged/%d/%n
  prefix = .DELETED/
  separator = /
}
namespace inbox {
  inbox = yes
  location = 
  mailbox Drafts {
    auto = subscribe
    special_use = \Drafts
  }
  mailbox Junk {
    auto = subscribe
    special_use = \Junk
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox Trash {
    auto = subscribe
    special_use = \Trash
  }
  prefix = 
  separator = /
}
passdb {
  args = /etc/dovecot/dovecot-mysql.conf
  driver = sql
}
passdb {
  args = /etc/dovecot/dovecot-fallback-password-mysql.conf
  driver = sql
}
passdb {
  args = /etc/dovecot/dovecot-fallback-mysql.conf
  driver = sql
}
passdb {
  args = /etc/dovecot/dovecot-master-users-password
  driver = passwd-file
  master = yes
}
plugin {
  acl = vfile:/etc/dovecot/dovecot-acl
  acl_globals_only = yes
  auth_socket_path = /var/run/dovecot/auth-master
  lazy_expunge = .DELETED/
  quota = dict:user::proxy::quotadict
  quota_grace = 0%%
  quota_max_mail_size = 70M
  quota_rule = *:storage=1G
  quota_rule2 = *:messages=0
  quota_warning = storage=85%% quota-warning 85 %u
  quota_warning2 = storage=90%% quota-warning 90 %u
  quota_warning3 = storage=95%% quota-warning 95 %u
  sieve = /%Lh/sieve/dovecot.sieve
  sieve_default = /var/vmail/sieve/dovecot.sieve
  sieve_default_name = managesieve
  sieve_dir = /%Lh/sieve
}
protocols = pop3 imap sieve
service anvil {
  client_limit = 20500
}
service auth {
  client_limit = 20500
  unix_listener /var/spool/postfix/dovecot-auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-master {
    group = vmail
    mode = 0666
    user = vmail
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service dict {
  unix_listener dict {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service imap-login {
  process_min_avail = 24
  service_count = 0
  vsz_limit = 2 G
}
service imap {
  process_limit = 1024000
  process_min_avail = 24
  vsz_limit = 2 G
}
service pop3-login {
  service_count = 0
}
service quota-warning {
  executable = script /usr/local/bin/dovecot-quota-warning.sh
  unix_listener quota-warning {
    group = vmail
    mode = 0660
    user = vmail
  }
}
ssl_ca = </etc/pki/tls/certs/cndns.com.ca-bundle
ssl_cert = </etc/pki/tls/certs/cndns.com.crt
ssl_key =  # hidden, use -P to show it
syslog_facility = local6
userdb {
  args = /etc/dovecot/dovecot-mysql.conf
  driver = sql
}
userdb {
  args = /etc/dovecot/dovecot-fallback-user-mysql.conf
  driver = sql
}
protocol lda {
  auth_socket_path = /var/run/dovecot/auth-master
  lda_mailbox_autocreate = yes
  mail_fsync = optimized
  mail_plugins = quota lazy_expunge zlib sieve
  postmaster_address = root
  syslog_facility = local6
}
protocol imap {
  imap_client_workarounds = tb-extra-mailbox-sep
  imap_id_send = NAME dovecot VERSION 2.1.17
  mail_max_userip_connections = 20
  mail_plugins = quota lazy_expunge zlib imap_quota  mail_log imap_zlib notify
}
protocol pop3 {
  mail_max_userip_connections = 20
  mail_plugins = quota lazy_expunge zlib mail_log notify
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
  pop3_uidl_format = %08Xu%08Xv
}



hfh at cndns.com
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