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https://issues.apache.org/jira/browse/SOLR-3251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13622773#comment-13622773
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Steve Rowe commented on SOLR-3251:
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bq. Hmmm, There's already the possibility of sharing schemas, they're cached by
path and time as I remember.
Updating a shared schema will be live for every core that uses it. Persistence
will cause new cores that are supposed to share to load a new schema object
into the cache, but cores using the no-longer-cached version will continue to
use it instead of getting refreshed. This will result in partitioning the
cores into groups that *really* share schemas. Maybe cache keys should use a
hash instead of a time stamp?
bq. I'm also working on config sets as we speak. Any interactions here that
spring to mind? I suppose I'll have to be looking at invalidating any shared
config set if any of the underlying files change. I admit I haven't looked into
the code at all, maybe this'll all be transparent to the config set caching
layer but it'll be a good thing for me to be aware of when I get back to that
JIRA (I've got some work done on it, not testable yet though).
Sorry, I'm not sure about the interactions - what I do know is that since
updates are on the live schema, persistence happens as a side effect of changes
- after startup, the persisted schema is never read again. Since modifications
can only be made after turning on the "managed schema" facility, external
modification can be ignored. Actually, that argues further for hashes instead
of time stamps for cache keys.
I'm wrapping up testing, and will post a patch soon. If there are no
objections, I'll commit this in its current state, and we can make further
changes, including the caching changes, on following issues.
> dynamically add field to schema
> -------------------------------
>
> Key: SOLR-3251
> URL: https://issues.apache.org/jira/browse/SOLR-3251
> Project: Solr
> Issue Type: New Feature
> Reporter: Yonik Seeley
> Assignee: Steve Rowe
> Attachments: SOLR-3251.patch, SOLR-3251.patch
>
>
> One related piece of functionality needed for SOLR-3250 is the ability to
> dynamically add a field to the schema.
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