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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Closed: (LUCENE-454) lazily create SegmentMergeInfo.docMap
Date Fri, 28 Oct 2005 03:52:58 GMT
     [ http://issues.apache.org/jira/browse/LUCENE-454?page=all ]
     
Yonik Seeley closed LUCENE-454:
-------------------------------


> lazily create SegmentMergeInfo.docMap
> -------------------------------------
>
>          Key: LUCENE-454
>          URL: http://issues.apache.org/jira/browse/LUCENE-454
>      Project: Lucene - Java
>         Type: Improvement
>     Versions: CVS Nightly - Specify date in submission
>     Reporter: Yonik Seeley
>     Assignee: Yonik Seeley
>      Fix For: 1.9
>  Attachments: docMap.txt, docMap.txt
>
> Since creating the docMap is expensive, and it's only used during segment merging, not
searching, defer creation until it is requested.
> SegmentMergeInfo is also used in MultiTermEnum, the term enumerator for a MultiReader.
 TermEnum is used by queries such as PrefixQuery, RangeQuery, WildcardQuery, as well as RangeFilter,
DateFilter, and sorting the first time (filling the FieldCache).
> Performance Results:
>   A simple single field index with 555,555 documents, and 1000 random deletions was queried
1000 times with a PrefixQuery matching a single document.
> Performance Before Patch:
>   indexing time = 121,656 ms
>   querying time = 58,812 ms
> Performance After Patch:
>   indexing time = 121,000 ms
>   querying time =         598 ms
> A 100 fold increase in query performance!
> All lucene unit tests pass.

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