Strategy for fts

[Joan Moreau]

I updated fts-xapian to make it compatible with dovecot 2.2

On 2020-02-04 12:37, Peter Chiochetti wrote:

> Am 04.02.20 um 11:46 schrieb Francis Augusto Medeiros-Logeay: 
> 
>> Hi Philon,
>> 
>> Thanks a lot for your thoughts!
>> 
>> Can I ask you if using Solr improved things for you? I have a mailbox with 15 years of e-mail and searching things take a long time.
> 
> Here, SOLR itself searches a quarter million mails in split seconds and returns very good results. That is on a low memory average machine.
> 
> If you dont mind the standard, you can change the schema, so headers (from, to) get indexed in body text. That can help narrowing results.
> 
> Only problem is search through e.g. nested folders from IMAP: something like ESEARCH would be nice - https://tools.ietf.org/html/rfc6237
> 
> Peter
> 
> On 04.02.2020 09:39, Philon wrote: Hi Francis,
> 
> next to fts-solr there was fts-lucene. But that Lucene there seems
> heavily outdated why the Dovecot docs also suggest using Solr.
> Elasticsearch probably is similar to Solr but the later is maintained
> by Dovecot team.
> 
> I started with downloading the Solr binary distribution to Debian with
> JRE preinstalled and things were running like after 10 min. Yes it's a
> bit more complicated to find the schema and edit things like header
> size (in tips section). It's running quite nicely since then and has
> zero maintenance. 
> I will try again - I kept getting some weird errors, so I don't know if that's why I wasn't seing much of improvement.
> 
> As FTS indexes are separate in external Solr instance I'd guess that
> it won't interfere with dsync. What I don't know is if dsync'ing would
> trigger indexing. This brings me to wonder how one could actually
> replicate the Solr instance!? 
> Good question. But what I thought about doing was to install FTS on my backup instance, and if things go fine, then I install an FTS instance on my production server - that is, if one doesn't interfere with the other.
> 
> I will give Solr another shot - my worries are mostly if Solr is supported on ARM (my prod instance is running on ARM) - I know Elasticsearch has an ARM build.
> 
> Ii thought about the Xapian engine, but since it requires dovecot 2.3, I will have to wait.
> 
> Best,
> 
> Francis
> 
> Philon
> 
> On 31 Jan 2020, at 17:24, Francis Augusto Medeiros-Logeay <r_f at med-lo.eu> wrote:
> 
> Hi there,
> 
> I got successfully to replicate my mail server to another dovecot install using dsync, mainly for redundancy, and it works great.
> 
> I want to try to install fts, as some of the mailboxes have tens of thousands of messages, and it takes minutes to get some results when searching via IMAP on a Roundcube interface.
> 
> I want to experiment with fts-solr first, and firstly on my redundant server, ie., not on my main dovecot install. Is it ok to do this? I ask because I am afraid of how this whole reindexing on the redundant install will affect the production server.
> 
> Also, any tips on something else than fts-solr? I tried it once, but it was so hard to get it right, so many configurations, java, etc., that I'd rather try something else. I also could try fts-elastic or something like that, but, again, having to maintain an elasticsearch install might use more resources than I think is worth. Any thoughts on that?
> 
> Best,
> 
> -- Francis
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