[jira] [Commented] (SOLR-3251) dynamically add field to schema

["Yonik Seeley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-3251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269699#comment-13269699 ] 

Yonik Seeley commented on SOLR-3251:
------------------------------------

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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