Hi,
If an IMAP fetch is issued some "short" time after a message was delivered with dovecot deliver then dovecot reports wrong (zero) values for that new message. Afterward, it reports the information OK.
This causes problems to our IMAP client. The problem is easily reproduced with a large message on a slow machine. I'm using dovecot 1.0.10
Here's a sample trace:
1 uid fetch 1:* fast
- 1 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:20:50 +0200" RFC822.SIZE 3378380 UID 1)
- 2 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:21:40 +0200" RFC822.SIZE 3378380 UID 2)
- 3 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:23:38 +0200" RFC822.SIZE 3378380 UID 3)
- 4 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:40:06 +0200" RFC822.SIZE 3378380 UID 4) 1 OK Fetch completed.
######## Here dovecot reports a new message (5) arrived ######## 1 uid fetch 1:* fast
- 1 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:20:50 +0200" RFC822.SIZE 3378380 UID 1)
- 2 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:21:40 +0200" RFC822.SIZE 3378380 UID 2)
- 3 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:23:38 +0200" RFC822.SIZE 3378380 UID 3)
- 4 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:40:06 +0200" RFC822.SIZE 3378380 UID 4)
- 5 EXISTS
- 5 RECENT 1 OK Fetch completed.
######## This is where dovecot reports wrong information about message 5 ######## 1 uid fetch 1:* fast
- 1 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:20:50 +0200" RFC822.SIZE 3378380 UID 1)
- 2 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:21:40 +0200" RFC822.SIZE 3378380 UID 2)
- 3 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:23:38 +0200" RFC822.SIZE 3378380 UID 3)
- 4 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:40:06 +0200" RFC822.SIZE 3378380 UID 4)
- 5 FETCH (FLAGS (\Recent) INTERNALDATE "01-Jan-1970 00:00:00 +0000" RFC822.SIZE 0 UID 5) 1 OK Fetch completed.
######## The same wrong information is repeated ######## 1 uid fetch 1:* fast
- 1 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:20:50 +0200" RFC822.SIZE 3378380 UID 1)
- 2 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:21:40 +0200" RFC822.SIZE 3378380 UID 2)
- 3 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:23:38 +0200" RFC822.SIZE 3378380 UID 3)
- 4 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:40:06 +0200" RFC822.SIZE 3378380 UID 4)
- 5 FETCH (FLAGS (\Recent) INTERNALDATE "01-Jan-1970 00:00:00 +0000" RFC822.SIZE 0 UID 5) 1 OK Fetch completed.
######## The same wrong information is repeated several times ######## 1 uid fetch 1:* fast
- 1 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:20:50 +0200" RFC822.SIZE 3378380 UID 1)
- 2 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:21:40 +0200" RFC822.SIZE 3378380 UID 2)
- 3 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:23:38 +0200" RFC822.SIZE 3378380 UID 3)
- 4 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:40:06 +0200" RFC822.SIZE 3378380 UID 4)
- 5 FETCH (FLAGS (\Recent) INTERNALDATE "01-Jan-1970 00:00:00 +0000" RFC822.SIZE 0 UID 5) 1 OK Fetch completed.
######## Trace truncated here ########
######## Finally, correct information is reported ######## 1 uid fetch 1:* fast
- 1 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:20:50 +0200" RFC822.SIZE 3378380 UID 1)
- 2 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:21:40 +0200" RFC822.SIZE 3378380 UID 2)
- 3 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:23:38 +0200" RFC822.SIZE 3378380 UID 3)
- 4 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:40:06 +0200" RFC822.SIZE 3378380 UID 4)
- 5 FETCH (FLAGS (\Recent) INTERNALDATE "06-Mar-2008 17:41:07 +0200" RFC822.SIZE 3378380 UID 5)
dovecot -n: # 1.0.10: /etc/dovecot.conf log_timestamp: “%Y-%m-%d %H:%M:%S ” protocols: imap listen: *:143 ssl_disable: yes login_dir: /var/run/dovecot/login login_executable: /usr/libexec/dovecot/imap-login login_process_per_connection: no first_valid_uid: 150 last_valid_uid: 150 dotlock_use_excl: yes fsync_disable: yes maildir_copy_with_hardlinks: yes maildir_copy_preserve_filename: yes mail_plugins: quota imap_quota auth default: mechanisms: plain login user: nobody master_user_separator: * passdb: driver: sql args: /etc/dovecot-sql.conf passdb: driver: passwd-file args: /etc/dovecot.masterusers master: yes userdb: driver: prefetch userdb: driver: sql args: /etc/dovecot-sql.conf socket: type: listen client: path: /var/spool/postfix/private/auth mode: 432 user: postfix group: postfix master: path: /var/run/dovecot/auth-master mode: 432 user: vmail group: mail plugin: quota: maildir:storage=1024
Thanks, Ron
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