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From "Han Jiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4225) New FixedPostingsFormat for less overhead than SepPostingsFormat
Date Tue, 17 Jul 2012 12:30:34 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416136#comment-13416136
] 

Han Jiang commented on LUCENE-4225:
-----------------------------------

Oh...OK, those fails are all related to payload. 
                
> New FixedPostingsFormat for less overhead than SepPostingsFormat
> ----------------------------------------------------------------
>
>                 Key: LUCENE-4225
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4225
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>         Attachments: LUCENE-4225-on-rev-1362013.patch, LUCENE-4225.patch
>
>
> I've worked out the start at a new postings format that should have
> less overhead for fixed-int[] encoders (For,PFor)... using ideas from
> the old bulk branch, and new ideas from Robert.
> It's only a start: there's no payloads support yet, and I haven't run
> Lucene's tests with it, except for one new test I added that tries to
> be a thorough PostingsFormat tester (to make it easier to create new
> postings formats).  It does pass luceneutil's performance test, so
> it's at least able to run those queries correctly...
> Like Lucene40, it uses two files (though once we add payloads it may
> be 3).  The .doc file interleaves doc delta and freq blocks, and .pos
> has position delta blocks.  Unlike sep, blocks are NOT shared across
> terms; instead, it uses block encoding if there are enough ints to
> encode, else the same Lucene40 vInt format.  This means low-freq terms
> (< 128 = current default block size) are always vInts, and high-freq
> terms will have some number of blocks, with a vInt final block.
> Skip points are only recorded at block starts.

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