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https://issues.apache.org/jira/browse/SOLR-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12623416#action_12623416
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Noble Paul commented on SOLR-139:
---------------------------------

there are pros and cons w/ each approaches (am I discovering a universal truth 
here ;) )

Many approaches can to confuse users . I can propose something like 

<modifiable>true</modifiable> in the manIndex .
And say 
<modificationStrategy>solr.SepareteIndexStrategy</modificationStrategy>
or
<modificationStrategy>solr.SameIndexStrategy</modificationStrategy>

(I did not mention  the other two because of personal preferences ;)  )

> 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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