Add support for subsets of searchables inside a
MultiSearcher/ParallelMultiSearcher instance's methods at runtime
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Key: LUCENE-2447
URL: https://issues.apache.org/jira/browse/LUCENE-2447
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Affects Versions: 3.0.1
Environment: Irrelevant
Reporter: Edward Drapkin
Priority: Minor
Attachments: LUCENE-2447.patch
Here's the situation: We have a site with a fair few amount of indexes that
we're using MultiSearcher/ParallelMultiSearcher for, but the users can select
an arbitrary permutation of indexes to search. For example (contrived, but
illustratory): the site has indexes numbered 1 - 10; user A wants to search in
all 10; user B wants to search indexes 1, 2 and 3, user C wants to search
even-numbered indexes. From Lucene 3.0.1, the only way to do this is to
continually instantiate a new MultiSearcher based on every permutation of
indexes that a user wants, which is not ideal at all.
What I've done is add a new parameter to all methods in MultiSearcher that use
the searchables array (docFreq, search, rewrite and createDocFrequencyMap), a
Set<Searchable> which is checked for isEmpty() and contains() for every
iteration over the searchables[]. The actual logic has been moved into these
methods and the old methods have become overloads that pass a
Collections.emptySet() into those methods, so I do not expect there to be a
very noticeable performance impact as a result of this modification, if it's
measurable at all.
I didn't modify the test for MultiSearcher very much, just enough to illustrate
the that subsetting of the search results works, since no other logic has
changed. If I need to do more for the testing, let me know and I'll do it.
I've attached the patches for MultiSearcher.java, ParallelMultiSearcher.java
and TestMultiSearcher.java.
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