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From "Steven Tamm (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-528) Optimization for IndexWriter.addIndexes()
Date Tue, 21 Mar 2006 22:16:58 GMT
     [ http://issues.apache.org/jira/browse/LUCENE-528?page=all ]

Steven Tamm updated LUCENE-528:
-------------------------------

    Attachment: AddIndexes.patch

> Optimization for IndexWriter.addIndexes()
> -----------------------------------------
>
>          Key: LUCENE-528
>          URL: http://issues.apache.org/jira/browse/LUCENE-528
>      Project: Lucene - Java
>         Type: Improvement
>   Components: Index
>     Reporter: Steven Tamm
>     Priority: Minor
>  Attachments: AddIndexes.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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