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Date: Thu, 25 Oct 2007 15:17:54 -0700 (PDT)
From: "Michael Klatt (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Updated: (LUCENE-1034) Add new API method to retrieve
 document field data in a batch
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     [ https://issues.apache.org/jira/browse/LUCENE-1034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Klatt updated LUCENE-1034:
----------------------------------

    Attachment: MultiReader.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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