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https://issues.apache.org/jira/browse/SOLR-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12512602
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Yonik Seeley commented on SOLR-139:
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> I like having the the actual document manipulation happening in the Processor
> because it is an easy
> place to put in other things like grabbing stuff from a SQL database.
The update handler could call the processor when it was time to do the
manipulation too.
Consider the case of future support for ParallelReader, where some fields are
in one sub-index and some fields are in another sub-index. I'm not sure if our
current processor interfaces will be able to handle that scenario well (but I'm
not sure if we should worry about it too much right now either).
There is another way to perhaps mitigate the problem of a few frequently
modified documents causing thrashing: a document cache in the update handler.
> 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-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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