Dovecot frequently full-text reindexes the whole maildir

[vitalif at yourcmc.ru]

Thanks, after rewriting anti-spam scripts to doveadm and changing the 
search engine to fts-lucene fulltext indexing started to work reliably 
(fts-squat has constantly corrupted its index files, but lucene is 
working OK).

Now I have another small question: 'doveadm expunge' (even with -v) does 
not print any errors, but always returns exit code 68 in my case. What 
does it mean? I would like to get zero exit code in case of success...

> Hi,
> 
> I'm not an expert, but am doing something similar (moving messages and
> training the spam filter).
> 
> To detect the existence of new messages looking directly at the
> maildir can be a quick and dirty solution to get a trigger event.
> 
> But to move or delete I think you should use  'doveadm' to search for
> all messages in your spam directory and get a list of all uids an
> guids. Then you can call doveadm again to move vor delete the messages
> by id.
> 
> Just look for "doveadm search/move/purge" in the dovecot wiki.
> This should ensure that the indexes stay up to date.
> 
> Am 27. Oktober 2015 11:24:39 MEZ, schrieb vitalif at yourcmc.ru:
>> Hi!
>> 
>> I'm using Dovecot 2.2.13 (Debian Jessie package 1:2.2.13-12~deb8u1) on
>> my personal mail server (the address I'm writing from is on this
>> server).
>> 
>> I use Maildirs, I have fts + fts_squat enabled, and I have a problem
>> with it for a long time - dovecot seems to not update the index always
>> "incrementally".
>> 
>> Yesterday I've finally made a test by telneting to imap port and
>> issuing
>> a search request. Dovecot started to reindex the mailbox. Full
>> reindexing has taken around 15-20 minutes.
>> 
>> After reindexing the fulltext searches were fast, just as they should
>> be. And they were fast yesterday even after some new emails arrived.
>> 
>> But I've tried to do a new search today and Dovecot started to reindex
>> the whole maildir again!
>> 
>> Why is it reindexing the whole maildir again? Could it be related to 
>> my
>> 
>> anti-spam scripts removing messages from SPAM imap folder? And if yes,
>> how to remove them correctly?
>> 

-- 
With best regards,
   Vitaliy Filippov