Database upgrade and Xapian version dependency

[Robert Stepanek]

On Mon, Jan 27, 2020, at 9:51 AM, Egoitz Aurrekoetxea via Info-cyrus wrote:
> Just for having it slightly clearer… When you upgrade the Cyrus version and the version you are upgrading to is a too close one… for instance from 3.0.8 to 3.0.13 and you see the Cyrus version is the same for users mail folders, 13 in both… is it needed to launch (or recommended for some reason) the final upgrade commands : 
> 
> reconstruct -V max
> ctl_conversationsdb -b -r
> quota -f

I'm not sure. Perhaps @ellie could answer that?

> By the way, does exist any kind of Xapian needed version for the last 3.0.13 version?. I’m running Xapian 1.4.9, it’s pretty new…

One feature that's missing in Xapian 1.4 is improved support for Chinese and Japanese snippet generation. If you don't need that, you should be fine with 1.4. Otherwise I suggest to use either Xapian upstream master, or our cyruslibs copy at https://github.com/cyrusimap/cyruslibs 

Cheers,
Robert
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