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https://issues.apache.org/jira/browse/SOLR-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12509608
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Yonik Seeley commented on SOLR-139:
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Another use case to keep in mind... someone might use an UpdateRequestProcessor
to add new fields to a document (something like copyField, but more complex).
Some of this logic might be based on the value of other fields themselves.
example1: a userTag field that represents tags on objects of the form
user#tagstring.
If user==member, then add tagstring to the indexed-only ownerTags field, else
add the tagstring to the socialTags field.
example2: an UpdateRequestProcessor is used to encode the value of a field with
rot13... this should obviously only be done for new field values, and not
values that are just being re-stored, so the UpdateRequestProcessor needs to be
able to distinguish between the two.
example3: some field values are pulled from a database when missing rather than
being stored values.
I think we need to try to find the right UpdateRequestProcessor interface to
support all these with UpdateableDocuments.
> 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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