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From "Ning Li (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-528) Optimization for IndexWriter.addIndexes()
Date Thu, 26 Oct 2006 14:39:19 GMT
     [ http://issues.apache.org/jira/browse/LUCENE-528?page=all ]

Ning Li updated LUCENE-528:
---------------------------

    Lucene Fields: [Patch Available]

> Optimization for IndexWriter.addIndexes()
> -----------------------------------------
>
>                 Key: LUCENE-528
>                 URL: http://issues.apache.org/jira/browse/LUCENE-528
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Steven Tamm
>         Assigned To: Otis Gospodnetic
>            Priority: Minor
>         Attachments: AddIndexes.patch, AddIndexesNoOptimize.patch
>
>
> One big performance problem with IndexWriter.addIndexes() is that it has to optimize
the index both before and after adding the segments.  When you have a very large index, to
which you are adding batches of small updates, these calls to optimize make using addIndexes()
impossible.  It makes parallel updates very frustrating.
> Here is an optimized function that helps out by calling mergeSegments only on the newly
added documents.  It will try to avoid calling mergeSegments until the end, unless you're
adding a lot of documents at once.
> I also have an extensive unit test that verifies that this function works correctly if
people are interested.  I gave it a different name because it has very different performance
characteristics which can make querying take longer.

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