Re: [VuFind-Tech] multiple solr-cores

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I have just reopened ticket VUFIND-652 since VuFind 2.0 should now be able to implement sharded MoreLikeThis functionality thanks to the resolution of SOLR-788.  Does anybody have time to work on implementation?

http://vufind.org/jira/browse/VUFIND-652

- Demian

> -----Original Message-----
> From: Oliver Goldschmidt [mailto:o.g...@tu...]
> Sent: Wednesday, June 19, 2013 10:40 AM
> To: vuf...@li...
> Subject: Re: [VuFind-Tech] multiple solr-cores
> 
> As far as I know, sharding supports "more like this" starting with Solr
> 4 (as described here: https://issues.apache.org/jira/browse/SOLR-788).
> 
> We are using sharding for seperating cores from different sources (e.g.
> our website index). Since we are still using Solr 3, I have developed a
> workaround to get "More like this" hits from one of the shards. This is
> a good option for us, since we only want to have "more like this" hits
> from our main index, and it might not be an option if you have more than
> one equitable cores. Then, you might need to switch to Solr 4.
> 
> Best
> -- Oliver
> 
> Am 19.06.2013 16:26, schrieb Mark Noble:
> > We used the sharded approach to keep our print materials and ebooks
> > separate, but I recently changed it to use a single core because several
> > of the features I wanted to take advantage of didn't work in a sharded
> > environment.  The final reason for me to move away from sharding was the
> > "more like this" functionality not working with shards.
> >
> > Now we just keep everything in one core and delete bulk records based on
> > the record type.
> >
> > - Mark
> >
> >
> > On 6/19/2013 6:40 AM, Demian Katz wrote:
> >> Assuming that the two cores have the same schema and do not have
> overlapping ID values, you can merge them together using Solr sharding.
> Sharding can be turned on in searches.ini -- comments in the file document the
> relevant settings (just search for "shard" and you should find everything).
> >>
> >> The main disadvantages to sharding are that performance may be slower, and
> not all Solr features work in a distributed environment ("more like this" may
> stop working, for example).
> >>
> >> Let me know if you need more details!
> >>
> >> - Demian
> >>
> >>> -----Original Message-----
> >>> From: Oliver Schihin [mailto:oli...@un...]
> >>> Sent: Wednesday, June 19, 2013 8:22 AM
> >>> To: VuFind Tech Mailinglist
> >>> Subject: [VuFind-Tech] multiple solr-cores
> >>>
> >>> Hello
> >>>
> >>> Is there a simple way to talk to multiple solr cores of the same instance?
> I
> >>> do have the
> >>> configuration default_core in the config.ini. Can I point it to two cores,
> or
> >>> is there
> >>> another directive?
> >>>
> >>> Background: We would have two cores, one with local bibliographical data,
> the
> >>> other with
> >>> aggregated ebook-data. The recordtype would be the same, and we could
> simply
> >>> load the data
> >>> into the same core. I am doing that now for testing. But to separate the
> cores
> >>> would be a
> >>> possible simplification in handling, as the ebook-data is fully deleted
> and
> >>> reloaded on a
> >>> regular basis.
> >>>
> >>> We are on VF2
> >>>
> >>> Thanks & Regards
> >>> Oliver
> >>>
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> 
> --
> Oliver Goldschmidt
> TU Hamburg-Harburg / Universitätsbibliothek / Digitale Dienste
> Denickestr. 22
> 21071 Hamburg - Harburg
> Tel. 	+49 (0)40 / 428 78 - 32 91
> eMail	o.g...@tu...
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