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From "Ahmet Arslan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5052) bitset codec for off heap filters
Date Thu, 13 Mar 2014 18:43:42 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13933863#comment-13933863
] 

Ahmet Arslan commented on LUCENE-5052:
--------------------------------------

Hi [~spo], paper link seem broken? Gives 404 to me.

> bitset codec for off heap filters
> ---------------------------------
>
>                 Key: LUCENE-5052
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5052
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: core/codecs
>            Reporter: Mikhail Khludnev
>              Labels: features
>             Fix For: 5.0
>
>         Attachments: LUCENE-5052.patch, bitsetcodec.zip, bitsetcodec.zip
>
>
> Colleagues,
> When we filter we don’t care any of scoring factors i.e. norms, positions, tf, but
it should be fast. The obvious way to handle this is to decode postings list and cache it
in heap (CachingWrappingFilter, Solr’s DocSet). Both of consuming a heap and decoding as
well are expensive. 
> Let’s write a posting list as a bitset, if df is greater than segment's maxdocs/8 
(what about skiplists? and overall performance?). 
> Beside of the codec implementation, the trickiest part to me is to design API for this.
How we can let the app know that a term query don’t need to be cached in heap, but can be
held as an mmaped bitset?
> WDYT?  



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