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https://issues.apache.org/jira/browse/SOLR-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12509635
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Yonik Seeley commented on SOLR-139:
-----------------------------------

> (as long as you don't need multiple of them). 

If you had a bunch of independent things you wanted to do, having a single 
processor forces you to squish them together (say you even added another 
document type to your index and then wanted to add another mutation operation).

What if we had some sort of hybrid between the two approaches. Had a list of 
processors, and the last would have primary responsibility for getting the 
documents in the index?

> Support updateable/modifiable documents
> ---------------------------------------
>
>                 Key: SOLR-139
>                 URL: https://issues.apache.org/jira/browse/SOLR-139
>             Project: Solr
>          Issue Type: Improvement
>          Components: update
>            Reporter: Ryan McKinley
>            Assignee: Ryan McKinley
>         Attachments: 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-XmlUpdater.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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