[Dovecot] dsync/imapc migration question

[Timo Sirainen]

On 1.7.2013, at 19.02, Gedalya <gedalya at gedalya.net> wrote:

> Doing an imapc migration with the pop3 migration plugin, using doveadm backup -R.
> 
> I occasionally get the following output:
> 
> dsync(user at domain.tld): Error: imapc(mail01.domain.tld:143): Server disconnected unexpectedly
> dsync(user at domain.tld): Error: imapc(mail01.domain.tld:143): Server disconnected unexpectedly
> dsync(user at domain.tld): Error: imapc(mail01.domain.tld:143): Server disconnected unexpectedly
> dsync(user at domain.tld): Warning: I/O leak: 0xb7648650 (line 1229, fd 10)
> dsync(user at domain.tld): Warning: I/O leak: 0xb7648650 (line 1229, fd 11)
> dsync(user at domain.tld): Warning: Timeout leak: 0xb76488b0 (line 1316)
> dsync(user at domain.tld): Warning: Timeout leak: 0xb76488b0 (line 1316)
> 
> The source server is really crappy, no need to look at the dovecot side for causes. My question is: is it possible that the migration did complete successfully? Dovecot does seem to continue and it's kind of vague on what went wrong, and did it re-try. This operation can take several hours on large mailboxes so this question is really meaningful in my case. (I'd try with -D but it's really hard to reproduce this on demand).

I think imapc automatically reconnects and retries the command. In any case you should retry if dsync returns non-zero exit code.

(The I/O and timeout leaks don't really matter, but they are also finally fixed in v2.2.3+.)