dovecot - Oct 2012 - Difference between Indexing and Rescan in FTS

I've had squat running on dovecot 2.0 and have been updating all users
mailbox indexes nighty via cron with this command:

doveadm -v search -A text xyzzyx

 

I've just updated to 2.1 and I'm migrating to lucene indexes, but
reading
the documentation I'm having a hard time understanding the semantic
differences between indexing and rescanning.

 

If I were to continue to run an all user all mailbox index every night,
would that be appropriate?

 

Would running this every night avoid the need to ever rescan?

 

Should I run rescan instead of index?

 

Should I run both rescan and index?  In which order?

 

Best Regards,

FredK

On 10/16/2012 6:14 PM, Fred Kilbourn wrote:
> I've had squat running on dovecot 2.0 and have been updating all users
> mailbox indexes nighty via cron with this command:
>
> doveadm -v search -A text xyzzyx
>
>   
>
> I've just updated to 2.1 and I'm migrating to lucene indexes, but
reading
> the documentation I'm having a hard time understanding the semantic
> differences between indexing and rescanning.
>
>   
>
> If I were to continue to run an all user all mailbox index every night,
> would that be appropriate?
>
>   
>
> Would running this every night avoid the need to ever rescan?
>
>   
2 sets of indexes.

dovecot indexes
FTS indexes

Performing the cron search will update the FTS indexes, although you 
should read up on 2.1's doveadm index command. The dovecot indexes 
should stay in sync. However, if they do lose track of the FTS indexes, 
you can do a rescan to sync them back up. Except for corruption or index 
changes made outside of dovecot, the two sets of indexes should stay in 
sync.


Jack

On 17.10.2012, at 2.14, Fred Kilbourn wrote:
> I've had squat running on dovecot 2.0 and have been updating all users
> mailbox indexes nighty via cron with this command:
> 
> doveadm -v search -A text xyzzyx
doveadm index is a bit more efficient.
> I've just updated to 2.1 and I'm migrating to lucene indexes, but
reading
> the documentation I'm having a hard time understanding the semantic
> differences between indexing and rescanning.
doveadm fts rescan makes sure that 1) all of the old messages are indexed and 2)
there are no extra (already deleted) messages indexed. So it's basically
repairing fts index. You probably shouldn't run it automatically, or at
least not very often.