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From Shawn Heisey <apa...@elyograg.org>
Subject Re: Where is schema.xml and solrconfig.xml in solr 5.0.0
Date Thu, 12 Mar 2015 15:32:26 GMT
On 3/12/2015 9:18 AM, Erick Erickson wrote:
> By and large, I really never use linking. But it's about associating a
> config set
> you've _already_ uploaded with a collection.
>
> So uploading is pushing the configset from your local machine up to Zookeeper,
> and linking is using that uploaded, named configuration with an
> arbitrary collection.
>
> But usually you just make this association when creating the collection.

The primary use case that I see for linkconfig is in testing upgrades to
configurations.  So let's say you have a production collection that uses
a config that you name fooV1 for foo version 1.  You can build a test
collection that uses a config named fooV2, work out all the bugs, and
then when you're ready to deploy it, you can use linkconfig to link your
production collection to fooV2, reload the collection, and you're using
the new config.  I haven't discussed here how to handle the situation
where a reindex is required.

One thing you CAN do is run linkconfig for a collection that doesn't
exist yet, and then you don't need to include collection.configName when
you create the collection, because the link is already present in
zookeeper.  I personally don't like doing things this way, but I'm
pretty sure it works.

Thanks,
Shawn


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