fts_solr: Error: fts_solr: received invalid uid '0'

13 Sep 2019


      Hi,
we are trying to add full text search functionality with Solr to our Doveoct setup. Our Versions:
OS: Debian 9
Tried versions:

Dovecot 2.2.7 with Solr 3.6
Dovecot 2.3.4 with Solr 8.2
(2.2.7 from offical Debian repository, 2.3.4 from backports)

Search is working mostly of the time perfrectly smooth. But sometimes following message appears in mail.err:
dovecot: imap(username)<16189><UxYWLVuSYMasEQoK>: Error: fts_solr: received invalid uid '0'
If this error occurs our webmail frontend delivers most of the time a timeout. Sometimes the search only takes really long.
Are  there any ideas why this error occurs? We are not able to reproduce the error in such a way that it would always be reproducible. However, we can reproduce the behavior in some form over and over again - but we do not know exactly what is decisive.
If you need any further information please ask - thanks! :-)
dovecont -n:
2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.4 ()
# OS: Linux 4.9.0-11-amd64 x86_64 Debian 9.11 ext4
# Hostname: localhost
auth_master_user_separator = *
auth_username_format = %Ln
default_client_limit = 5000
default_process_limit = 1000
default_vsz_limit = 256M
dict {
sqlquota = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
}
disable_plaintext_auth = no
first_valid_uid = 480
imap_capability = +XDOVECOT
lmtp_save_to_detail_mailbox = yes
mail_attribute_dict = file:/var/spool/dovecot/user/%n/Maildir/dovecot-attributes
mail_gid = vmail
mail_location = maildir:/var/spool/dovecot/user/%d/%n/Maildir:LAYOUT=fs
mail_plugins = " listescape mail_log notify quota acl fts fts_solr virtual"
mail_privileged_group = vmail
mail_uid = vmail
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
namespace {
hidden = yes
inbox = yes
list = no
location =
prefix =
separator = /
subscriptions = yes
}
namespace {
list = yes
location = maildir:%%h/Maildir:INDEXPVT=~/shared/%%u:LAYOUT=fs
prefix = shared/%%n/
separator = /
subscriptions = no
type = shared
}
namespace Public {
list = children
location = maildir:/var/spool/dovecot/public:INDEXPVT=~/public:LAYOUT=fs
prefix = Public/
separator = /
subscriptions = no
type = public
}
namespace Virtual {
hidden = no
list = yes
location = virtual:/etc/dovecot/virtual:INDEX=/var/spool/dovecot/user/%u/virtual
prefix = Virtual/
separator = /
subscriptions = no
}
namespace inbox {
inbox = no
location =
mailbox Drafts {
special_use = \Drafts
}
mailbox Junk {
special_use = \Junk
}
mailbox Sent {
special_use = \Sent
}
mailbox "Sent Messages" {
special_use = \Sent
}
mailbox Trash {
special_use = \Trash
}
prefix = INBOX/
separator = /
subscriptions = no
type = private
}
passdb {
args = /etc/dovecot/masteruser.%s
driver = passwd-file
master = yes
}
passdb {
args = /etc/dovecot/dovecot-ldap.conf.ext
driver = ldap
}
passdb {
args = scheme=CRYPT username_format=%u /etc/dovecot/users
driver = passwd-file
}
plugin {
acl = vfile
acl_anyone = allow
acl_shared_dict = file:/var/spool/dovecot/public/shared-mailboxes.db
fts = solr
fts_autoindex = yes
fts_solr = url=<a href="http://172.17.10.12:8983/solr/dovecot/" rel="noreferrer noopener" target="_blank">172.17.10.12:8983/solr/dovecot/</a>
quota = dict:User quota::no-unset:proxy::sqlquota
quota_rule = *:storage=10G
sieve = file:~/sieve;active=~/.dovecot.sieve
sieve_before = /var/spool/dovecot/globalsieve/duplicate.sieve
sieve_duplicate_default_period = 1h
sieve_duplicate_max_period = 1d
}
protocols = " imap lmtp sieve pop3"
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0660
user = postfix
}
}
service decode2text {
executable = script /usr/lib/dovecot/<a href="http://decode2text.sh" rel="noreferrer noopener" target="_blank">decode2text.sh</a>
unix_listener decode2text {
mode = 0666
}
user = dovecot
}
service dict {
unix_listener dict {
group = vmail
user = vmail
}
}
service lmtp {
unix_listener /var/spool/postfix/private/dovecot-lmtp {
group = postfix
mode = 0600
user = postfix
}
}
service managesieve-login {
inet_listener sieve {
port = 4190
}
}
ssl = no
userdb {
args = /etc/dovecot/mysql-userdb.conf.ext
driver = sql
}
protocol lmtp {
mail_plugins = " listescape mail_log notify quota acl fts fts_solr virtual acl quota sieve notify"
quota_full_tempfail = yes
}
protocol imap {
imap_capability = +XDOVECOT
mail_max_userip_connections = 100
mail_plugins = " listescape mail_log notify quota acl fts fts_solr virtual imap_acl imap_quota"
}
remote <a href="http://172.17.10.10" rel="noreferrer noopener" target="_blank">172.17.10.10</a> {
protocol imap {
imap_metadata = yes
}
}

fts_solr: Error: fts_solr: received invalid uid '0'

Fabian