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https://issues.apache.org/jira/browse/LUCENE-1034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Klatt updated LUCENE-1034:
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Attachment: SegmentReader.java.patch
> Add new API method to retrieve document field data in a batch
> -------------------------------------------------------------
>
> Key: LUCENE-1034
> URL: https://issues.apache.org/jira/browse/LUCENE-1034
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Affects Versions: 2.2
> Environment: JDK 1.5.X, Linux & FreeBSD
> Reporter: Michael Klatt
> Priority: Minor
> Attachments: FieldsReader.java.patch, IndexReader.java.patch,
> MultiReader.java.patch, SegmentReader.java.patch
>
>
> I've read in many forums about people who need to retrieve document data for
> a large number of search results. In our case, we need to retrieve up to
> 10,000 results (sometimes more) from an index of over 100 million documents
> (our index is about 65 GB). This can sometimes take a couple minutes.
> In one of my attempts to improve performance, I modified the IndexReader
> interface to provide a method which looks like:
> public Document[] documents(int[] n, FieldSelector fieldSelector);
> Instead of retrieving document data one at a time, I would request data for
> many document numbers in one shot. The idea was to optimize the seeks on
> disk so that in the FieldsReader, the seeks for the indexStream would be done
> first, then all the seeks in the fieldStream would be completed. For a
> large number of documents, this yielded a 20% speed improvement. The
> improvement was not as much as I was looking for, but I felt that the
> improvement was significant enough that I would request changes to the
> IndexReader interface.
> I'm providing patches for the files that I needed to change for our
> application. These patches are against the 2.2 release.
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