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https://issues.apache.org/jira/browse/LUCENE-4203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13411640#comment-13411640
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Michael McCandless commented on LUCENE-4203:
--------------------------------------------
OK I'll use AtomicReader, though it really must be a SegmentReader (we can cast
it) since we need the SegmentInfoPerCommit instance from it.
Hmm I suppose it could also be a CompositeReader (nrt DirectoryReader), and
then the method would have to resolve to the AtomicReader (SegmentReader) /
sub-docID.
> Add IndexWriter.tryDeleteDocument, to delete by document id when possible
> -------------------------------------------------------------------------
>
> Key: LUCENE-4203
> URL: https://issues.apache.org/jira/browse/LUCENE-4203
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index
> Reporter: Michael McCandless
> Attachments: LUCENE-4203.patch
>
>
> Spinoff from LUCENE-4069.
> In that use case, where the app needs to first lookup a document, then
> call updateDocument, it's wasteful today because the relatively costly
> lookup (by a primary key field, eg "id") is done twice.
> But, since you already resolved the PK to docID on the first lookup,
> it would be nice to then delete by that docID and then you can call
> addDocument instead.
> So I worked out a rough start at this, by adding
> IndexWriter.tryDeleteDocument. It'd be a very expert API: it takes a
> SegmentInfo (referencing the segment that contains the docID), and as
> long as that segment hasn't yet been merged away, it will mark the
> document for deletion and return true (success). If it has been
> merged away it returns false and the app must then delete-by-term. It
> only works if the writer is in NRT mode (ie you've opened an NRT
> reader).
> In LUCENE-4069 using tryDeleteDocument gave a ~20% net speedup.
> I think tryDeleteDocument would also be useful when Solr "updates" a
> document by loading all stored fields, changing them, and calling
> updateDocument.
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