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https://issues.apache.org/jira/browse/SOLR-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12470064
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Yonik Seeley commented on SOLR-139:
-----------------------------------
I browsed the code really quick, looking for the tricky part... It's here:
+ openSearcher();
+ Term t = new Term( uniqueKey.getName(), uniqueKey.getType().toInternal(
id.toString() ) );
+ int docID = searcher.getFirstMatch( t );
When you overwrite a document, it is really just adds another instance... so
the index contains multiple copies. When we "commit", deletes of the older
versions are performed. So you really want the *last* doc matching a term, not
the first.
Also, to need to make sure that the searcher you are using can actually "see"
the last document (once a searcher is opened, it sees documents that were added
since the last IndexWriter close().
So a quick fix would be to do a commit() first that would close the writer, and
then delete any old copies of docments.
Opening and closing readers and writers is *very* expensive though.
You can get slightly more sophisticated by checking the pset (set of pending
documents), and skip the commit() if the doc you are updating isn't in there
(so you know an older searcher will still have the freshest doc for that id).
We might be able to get more efficient yet in the future by leveraging
NewIndexModifier: SOLR-124
> 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
> Attachments: 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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