[ 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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