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https://issues.apache.org/jira/browse/SOLR-3251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269699#comment-13269699
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Yonik Seeley commented on SOLR-3251:
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bq. a low level implementation detail i would worry about is "snapshoting" the
schema for the duration of a single request .. i suspect there are more then a
few places in solr that would generate weird exceptions if multiple calls to
"req.getSchema().getFields()" returned different things in the middle of
processing a single request.
It's good to think about, but I'm not sure it will be a problem in practice.
Adding a new field shouldn't be an issue for most code.
Removing a field is a different matter... but if a query explicitly references
a field (for example) and then it disappears, having that cause an exception is
fine if it would also cause an exception if the field were missing.
Instead of snapshotting, I think we should think about where fields changing
could be a problem and then harden the code against that. If it does get too
difficult, then we could revisit schema snapshots.
> 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
> Attachments: 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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