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Doron Cohen commented on LUCENE-1812: ------------------------------------- I ran 'javadocs' under 3x/lucene/contrib/pruning and 'javadocs-all' under 3x/lucene. The latter failed due to multiple package.html under o.a.l.index - in core and under contrib/pruning. Entirely renaming the package to o.a.l.pruning.index won't work because PruningReader accesses package protected SegmentTermVector. I can move the other classes to that new package and keep only PruningReader in that "index friend" package. (Unless there are javadoc/ant tricks that will avoid this error and still generate valid javadocs in both cases). > Static index pruning by in-document term frequency (Carmel pruning) > ------------------------------------------------------------------- > > Key: LUCENE-1812 > URL: https://issues.apache.org/jira/browse/LUCENE-1812 > Project: Lucene - Java > Issue Type: New Feature > Components: modules/other > Reporter: Andrzej Bialecki > Assignee: Doron Cohen > Fix For: 3.6, 4.0 > > Attachments: pruning.patch, pruning.patch, pruning.patch, > pruning.patch, pruning.patch > > > This module provides tools to produce a subset of input indexes by removing > postings data for those terms where their in-document frequency is below a > specified threshold. The net effect of this processing is a much smaller > index that for common types of queries returns nearly identical top-N results > as compared with the original index, but with increased performance. > Optionally, stored values and term vectors can also be removed. This > functionality is largely independent, so it can be used without term pruning > (when term freq. threshold is set to 1). > As the threshold value increases, the total size of the index decreases, > search performance increases, and recall decreases (i.e. search quality > deteriorates). NOTE: especially phrase recall deteriorates significantly at > higher threshold values. > Primary purpose of this class is to produce small first-tier indexes that fit > completely in RAM, and store these indexes using > IndexWriter.addIndexes(IndexReader[]). Usually the performance of this class > will not be sufficient to use the resulting index view for on-the-fly pruning > and searching. > NOTE: If the input index is optimized (i.e. doesn't contain deletions) then > the index produced via IndexWriter.addIndexes(IndexReader[]) will preserve > internal document id-s so that they are in sync with the original index. This > means that all other auxiliary information not necessary for first-tier > processing, such as some stored fields, can also be removed, to be quickly > retrieved on-demand from the original index using the same internal document > id. > Threshold values can be specified globally (for terms in all fields) using > defaultThreshold parameter, and can be overriden using per-field or per-term > values supplied in a thresholds map. Keys in this map are either field names, > or terms in field:text format. The precedence of these values is the > following: first a per-term threshold is used if present, then per-field > threshold if present, and finally the default threshold. > A command-line tool (PruningTool) is provided for convenience. At this moment > it doesn't support all functionality available through API. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org