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https://issues.apache.org/jira/browse/SOLR-4083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13498495#comment-13498495
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Erick Erickson commented on SOLR-4083:
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OK, Old Macbook Pro (2009 vintage). Fresh boot and 15,000 cores in 150
directories 100 cores in each dir. Reading and parsing all the config files
takes 15 seconds or so, worst case scenario. Each core.properties file had the
properties listed below (although I doubt having only 1-2 entries/file would
make much difference).
instanceDir
schema
config
name
dataDir
shard
collection
roles
properties
So I decree that this is fast enough and we don't need to do anything fancy
here. NOTE: all this really does is create something akin to CoreDescriptors
for each of these dirs.
Robert and Yonik:
FWIW, thanks for pushing me on this, I'm not at all sure I'd have reached this
level of simplicity on my own....
> Deprecate specifying individual <core> information in solr.xml. Possibly
> deprecate solr.xml entirely
> ----------------------------------------------------------------------------------------------------
>
> Key: SOLR-4083
> URL: https://issues.apache.org/jira/browse/SOLR-4083
> Project: Solr
> Issue Type: Improvement
> Components: Schema and Analysis
> Affects Versions: 4.1, 5.0
> Reporter: Erick Erickson
> Assignee: Erick Erickson
>
> Spinoff from SOLR-1306. Having a solr.xml file is limiting and possibly
> unnecessary. We'd gain flexibility by having an "auto-discovery", essentially
> walking the directories and finding all the cores and just loading them.
> Here's an issue to start the discussion of what that would look like. At this
> point the way I'm thinking about it depends on SOLR-1306, which depends on
> SOLR-1028, so the chain is getting kind of long.
> Straw-man proposal:
> 1> system properties can be specified as root paths in the solr tree to start
> discovery.
> 2> the directory walking process will stop going deep (but not wide) in the
> directories whenever a solrcore.properties file is encountered. That file can
> contain any of the properties currently specifiable in a <core> tag. This
> allows, for instance, re-use of a single solrconfig.xml or schema.xml file
> across multiple cores. I really dont want to get into having
> cores-within-cores. While this latter is possible, I don't see any advantage.
> You _can_ have multiple roots and there's _no_ requirement that the cores be
> in the directory immediately below that root they can be arbitrarily deep.
> 3> I'm not quite sure what to do with the various properties in the <cores>
> tag. Perhaps just require these to be system properties?
> 4> Notice the title. Does it still make sense to specify <3> in solr.xml but
> ignore the cores stuff? It seems like so little information will be in
> solr.xml if we take all the <core> tags out that we should just kill it all
> together.
> 5> Not quite sure what this means for _where_ the cores live. Is it
> arbitrary? Anywyere on disk? Why not?
> 6> core swapping/renaming/whatever. Really, this is about how we model
> persist="true" on solr.xml. It's easy if we keep solr.xml and just remove the
> individual core entries. Where to put them?
> 7> _if_ we're supposed to persist core admin operations, it seems like we
> just persist this stuff to the individual solrcore.properties files. Things
> like whether it's loaded, whether its name has changed (1028 allows lazy
> loading).
> 8> This still provide the capability of your own custom
> CoreDescriptorProvider, which you'll have to specify somehow. I'm not quite
> sure where yet.
> solr.xml is really the bootstrap for the whole shootin' match. Removing it
> entirely means we have to specify root directories, zk parameters, whatever
> somehow. What do people think is the best option here? Leave a degenerate
> solr.xml? Require system properties be set for any of these options?
> Currently, the options we'll need are anything (actual or proposed) in the
> <solr> and <cores> tags.
> So, what the first cut at this would be, building on 1306, is a default
> CoreDescriptorProvider that ignored all the <core> entries in solr.xml,
> walked the tree and loaded all the cores found. I claim this is a quick thing
> to PoC assuming SOLR-1306 and I'll try to provide a patch demonstrating it
> over the weekend.
> But mostly, this is a place to start the discussion about what this would
> look like rather than have it get lost in SOLR-1306.
> finally, note that I have no intention of putting any of this into 4.x at
> least until we cut the 4.1/4.0.1 whatever.
> And, of course, until we fully deprecate solr.xml (5.0?) the current behavior
> will be the default.
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