On Sat, Aug 18, 2018, at 00:08, Albert Shih wrote:Le 16/08/2018 à 14:04:22+0200, Sebastian Hagedorn a écrit HiI have a question regarding the conversations db and how it affects (Xapian)>> search. In this GitHub issue (<https://github.com/cyrusimap/cyrus-imapd/issues/2376>) I was dealing with>> Xapian search always failing. The underlying reason turned out to be an>> empty conversations db. When I regenerate that user's conversations db,>> Xapian search works fine. So far, so good. But then I noticed this piece of>> documentation: <https://www.cyrusimap.org/imap/concepts/deployment/databases.html?high light=conversations#conversations-userid-conversations>>> Quote: "This file contains all the message-id fields from every email that>> has been seen in the ***past three months***, mapping to the conversation>> IDs in which this message ID has been seen, and the timestamp when it was>> last seen." This raises a number of questions. What does "has been seen" mean in this>> context? And does it mean that Xapian search will always fail to find emails>> that arrived more than three months ago?? That doesn't sound very useful ...>If I'm correct (I'm new with cyrus too), the conversations DB as nothing to> do with the database of xapian. The xapian database is some file with .glass extension and contain all the> index of all your mail. Those files stand inside t1searchpartition-default/FIRST_LETTER_OF_LOGIN/user/LOGIN/ The conversation database is some cyrus internal database use by cyrus to> **create** the xapian index. In other word the three months means, if you stop the xapian index now, you> have three months to restart it or you're going to need to regenerated the> xapian database from the beginning (and that take very loooong time).> Please if it's incorrect please someone correct me.That's incorrect - the messageids are actually only used for thread calculations - so if you get a new messages more than 3 months later, it won't be threaded with related messages (conversations.db threads only, aka: JMAP and XCONV commands). The G keys used for xapian are kept forever (at least: until the message is deleted from the index - which is not when it's expunged, but when cyr_expire cleans up the expunged record). Bron.
Thanks for the explanation. I will file a documentation bug so this is stated there.
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