[ http://issues.apache.org/jira/browse/LUCENE-454?page=all ]
Yonik Seeley resolved LUCENE-454:
---------------------------------
Fix Version: 1.9
Resolution: Fixed
Assign To: Yonik Seeley
> 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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