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https://issues.apache.org/jira/browse/SOLR-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12509615
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Ryan McKinley commented on SOLR-139:
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So you are suggesting pulling this out of the UpdateHandler and managing the
document merging in the UpdateRequestProcessor? (this might makes sense - It
was not an option when the patch started in feb)
How can the UpdateHandler get access to pending documents? should it just use
req.getSearcher()?
> 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.
>
1 & 2 seem pretty straightforwad
> example3: some field values are pulled from a database when missing rather
> than being stored values.
>
Do you mean as input or output? The UpdateRequestProcessor could not affect if
a field is stored or not, it could augment a document with more fields *before*
it is indexed. To add fields from a database rather then storing them, we
would need a hook at the end.
> 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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