[ 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. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
