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https://issues.apache.org/jira/browse/SOLR-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12516473
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Yonik Seeley commented on SOLR-139:
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So the big issue now is that I don't think we can use getStoredFields() and do
document modification outside the update handler. The biggest reason is that I
think we need to be able to update documents atomically (in the sense that
updates should not be lost).
Consider the usecase of adding a new tag to a multi-valued field: if two
different clients tag a document at the same time, it doesn't seem acceptable
that one of the tags could be lost. So I think that we need a modifyDocument()
call on updateHandler, and perhaps a ModifyUpdateCommand to go along with it.
I'm not sure yet what this means for request processors. Perhaps another
method that handles the reloaded storedFields?
> 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: 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-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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