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https://issues.apache.org/jira/browse/SOLR-880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erick Erickson updated SOLR-880:
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Attachment: SOLR-880.patch
First cut at the basics, putting up a preliminary version for comments.
The general approach here is that, for any lazy cores, keep a separate list of
SolrCoreDescriptors. When we get a core, if it's not already loaded, look in
this separate list and create it at that point.
Note a bunch of things:
1> many of the changes in CoreContainer are that I factored out creating cores
from local files and Zookeeper into two methods, I was having a hard time
keeping the zk and non-zk bits separate.
2> There are some TODOs and EOEs that I have to take out.
3> I'm not all that happy with the tests, especially making new config
directories just for this case with tests. But I was going a bit crazy
yesterday trying to use the "usual" methods for writing tests, but as far as I
can tell, there are built-in assumptions in things like TestHarness that don't
work well with different cores. Any suggestions?
4> All test pass. I fired up an example in our standard multicore system, and
it's actually kinda cool. The admin console doesn't show the lazy core, but I
can index to it with post.jar, then the admin screen shows it and I can query
it. I can shut down and restart and the first query on the lazy core then
returns results, even though it again isn't in the admin screen.
5> I haven't tested this all that thoroughly, this is preliminary for comments.
This is part of SOLR-1293.
6> Next up is SOLR-1028, limiting the number of cores that can be loaded
simultaneously.
7> I'm quite sure I'll screw up the reference counting and/or there are nooks
and crannies that I don't even know exist. Please let me know of any off the
tops of your heads!
8> All tests pass. Can I ship it now? <G>
> SolrCore should have a STOP option and a lazy startup option
> ------------------------------------------------------------
>
> Key: SOLR-880
> URL: https://issues.apache.org/jira/browse/SOLR-880
> Project: Solr
> Issue Type: Improvement
> Components: multicore
> Reporter: Noble Paul
> Assignee: Erick Erickson
> Attachments: SOLR-880.patch
>
>
> * We must have an option to STOP and START a core.
> * a core should have an option of loadOnStartup=true|false. default should be
> true
> * A list command which can give the names of all cores and some meta
> information like status
> If there are too many cores (tens of thousands) where each of them may be
> used occassionally, we should not load all of them at once. In the runtime I
> should be able to STOP and START a core on demand. A listing command would
> let me know which one is present and what is up and what is down. A stopped
> core must not use any resource
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