> -----Original Message----- > From: dovecot-boun...@dovecot.org [mailto:dovecot-boun...@dovecot.org] > On Behalf Of Jack Bates > Sent: Tuesday, October 16, 2012 9:44 PM > To: dovecot@dovecot.org > Subject: Re: [Dovecot] Difference between Indexing and Rescan in FTS > > 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
Thanks Jack, So here are my takeaways, let me know if I'm wrong: - The FTS index is the actual search data - The dovecot index holds, among other information, which messages are indexed by FTS - The FTS index still doesn't update automatically, so my nightly cronjob should keep it in order - The dovecot index should stay in order under normal circumstances, and issuing a resync command shouldn't be needed unless something bad happens Assuming my understanding above is correct, how about these questions, to further clarify my original questions: - As a system administrator, what signs should I look for that a resync is needed? (aside from user complaints) - What exact impact does running the resync command have? - Is it worthwhile to resync periodically as a maintenance task? - Or, does resyncing reset all FTS indexing that has been done, causing it to have to be done again from scratch? And, I did catch the revision in the user docs for updating indexes. I plan on updating my maintenance script accordingly. Thanks, Fred
