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From "Uwe Schindler (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-1536) if a filter can support random access API, we should use it
Date Fri, 07 Oct 2011 11:06:29 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1536?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uwe Schindler updated LUCENE-1536:
----------------------------------

    Attachment: LUCENE-1536-rewrite.patch

Improved patch with modules and contrib fixed, Solr still on TODO:
- BooleanFilter and ChainedFilter do not apply acceptDocs to their Filter clauses. Instead
they apply the acceptDocs on the final DocIdSet using BitsFilteredDocIdSet (see below). This
improves filter performance, as the deleted documents are not applied on each clause.
- New helper class BitsFilteredDocIdSet, which supplies a wrap method, that can apply a Bits
(e.g. acceptDocs) to a DocIdSet. This is useful for Filters, that build DocIdSets without
respecting the acceptDocs parameter and only want to apply the deletions live.
- CachingWrapperFilter and CachingSpanFilter now also use the acceptDocs wrapper, as the filters
are cached without acceptDocs.
- Fixed Javadocs, small changes to IndexSearcher
                
> if a filter can support random access API, we should use it
> -----------------------------------------------------------
>
>                 Key: LUCENE-1536
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1536
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/search
>    Affects Versions: 2.4
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>              Labels: gsoc2011, lucene-gsoc-11, mentor
>             Fix For: 4.0
>
>         Attachments: CachedFilterIndexReader.java, LUCENE-1536-rewrite.patch, LUCENE-1536-rewrite.patch,
LUCENE-1536-rewrite.patch, LUCENE-1536-rewrite.patch, LUCENE-1536-rewrite.patch, LUCENE-1536.patch,
LUCENE-1536.patch, LUCENE-1536.patch, LUCENE-1536.patch, LUCENE-1536.patch, LUCENE-1536.patch,
LUCENE-1536.patch, LUCENE-1536.patch, LUCENE-1536.patch, LUCENE-1536.patch, LUCENE-1536.patch,
LUCENE-1536.patch, LUCENE-1536.patch, LUCENE-1536.patch, LUCENE-1536.patch, LUCENE-1536.patch,
LUCENE-1536.patch, LUCENE-1536.patch, LUCENE-1536.patch, LUCENE-1536.patch
>
>
> I ran some performance tests, comparing applying a filter via
> random-access API instead of current trunk's iterator API.
> This was inspired by LUCENE-1476, where we realized deletions should
> really be implemented just like a filter, but then in testing found
> that switching deletions to iterator was a very sizable performance
> hit.
> Some notes on the test:
>   * Index is first 2M docs of Wikipedia.  Test machine is Mac OS X
>     10.5.6, quad core Intel CPU, 6 GB RAM, java 1.6.0_07-b06-153.
>   * I test across multiple queries.  1-X means an OR query, eg 1-4
>     means 1 OR 2 OR 3 OR 4, whereas +1-4 is an AND query, ie 1 AND 2
>     AND 3 AND 4.  "u s" means "united states" (phrase search).
>   * I test with multiple filter densities (0, 1, 2, 5, 10, 25, 75, 90,
>     95, 98, 99, 99.99999 (filter is non-null but all bits are set),
>     100 (filter=null, control)).
>   * Method high means I use random-access filter API in
>     IndexSearcher's main loop.  Method low means I use random-access
>     filter API down in SegmentTermDocs (just like deleted docs
>     today).
>   * Baseline (QPS) is current trunk, where filter is applied as iterator up
>     "high" (ie in IndexSearcher's search loop).

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