Strategy for fts and Replication

[Christian Kivalo]

On February 4, 2020 11:46:31 AM GMT+01:00, Francis Augusto Medeiros-Logeay <r_f at med-lo.eu> wrote:
>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.
It a vast improvement, more or less instant results. 
>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 heavily outdated why the Dovecot docs also suggest using Solr.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
>>> 

-- 
Christian Kivalo