Re: Xapian searches in Cyrus 3.0

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--On 3. Januar 2019 um 16:08:44 +0100 Robert Stepanek <rsto@xxxxxxxxxxxxxxxx> wrote:

On Thu, Jan 3, 2019, at 3:55 PM, Egoitz Aurrekoetxea wrote:
I was planning to perform mailboxes squattering in rolling mode. Have
you had some kind of expience on searching with Xapian and IMAP
protocol?. Perhaps is more designed for JMAP?. Or perhaps, using it
with IMAP is not so advantageous?.
Both IMAP and JMAP search share the same core search API in Cyrus, so
all search features available in JMAP can also be used using IMAP. The
key is to use FUZZY search for text search, and this can be an advantage
especially for non-English search over the other search backends.

A few additional comments:

With the setting "search_fuzzy_always: 1" all searches use Xapian. Otherwise searches from clients that don't use FUZZY run completely without a search index. There is no fallback mechanism to squatter. You also need to be careful with the conversationsdb. In my experience the DB is not updated when syncing from a 2.4 server to a 3.0 server. That means that you need ro rebuild each user's conversationdb manually using ctl_conversationsdb.
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