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https://issues.apache.org/jira/browse/SOLR-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12616570#action_12616570
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David Smiley commented on SOLR-139:
-----------------------------------

Ryan, I know of course the index can get big because one needs to store all the 
data for re-indexing; but due to Lucene's fundamental limitations, we can't get 
around that fact.  Moving the data off to another place (a DB of some sort or 
whatever) doesn't change the fundamental problem.  If one is unwilling to store 
a copy somewhere convenient due to data scalability issues then we simply 
cannot support the feature because Lucene doesn't have an underlying update 
capability.

If the schema's field isn't stored, then it may be useful to provide an API 
that can fetch un-stored fields for a given document.  I don't think it'd be 
common to use the API and definitely wouldn't be worth providing a default 
implementation.

> Support updateable/modifiable documents
> ---------------------------------------
>
>                 Key: SOLR-139
>                 URL: https://issues.apache.org/jira/browse/SOLR-139
>             Project: Solr
>          Issue Type: New Feature
>          Components: update
>            Reporter: Ryan McKinley
>            Assignee: Ryan McKinley
>         Attachments: Eriks-ModifiableDocument.patch, 
> Eriks-ModifiableDocument.patch, Eriks-ModifiableDocument.patch, 
> Eriks-ModifiableDocument.patch, Eriks-ModifiableDocument.patch, 
> Eriks-ModifiableDocument.patch, getStoredFields.patch, getStoredFields.patch, 
> getStoredFields.patch, getStoredFields.patch, getStoredFields.patch, 
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch, 
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch, 
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch, 
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch, 
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch, 
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-ModifyInputDocuments.patch, 
> SOLR-139-ModifyInputDocuments.patch, SOLR-139-ModifyInputDocuments.patch, 
> SOLR-139-ModifyInputDocuments.patch, SOLR-139-XmlUpdater.patch, 
> SOLR-269+139-ModifiableDocumentUpdateProcessor.patch
>
>
> It would be nice to be able to update some fields on a document without 
> having to insert the entire document.
> Given the way lucene is structured, (for now) one can only modify stored 
> fields.
> While we are at it, we can support incrementing an existing value - I think 
> this only makes sense for numbers.
> for background, see:
> http://www.nabble.com/loading-many-documents-by-ID-tf3145666.html#a8722293

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