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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2872) Terms dict should block-encode terms
Date Thu, 20 Jan 2011 00:31:43 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless updated LUCENE-2872:
---------------------------------------

    Attachment: LUCENE-2872.patch

New patch -- cleaned up all the nocommits, and cutover to common prefix for all terms in the
block.

> Terms dict should block-encode terms
> ------------------------------------
>
>                 Key: LUCENE-2872
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2872
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 4.0
>
>         Attachments: LUCENE-2872.patch, LUCENE-2872.patch
>
>
> With PrefixCodedTermsReader/Writer we now encode each term standalone,
> ie its bytes, metadata, details for postings (frq/prox file pointers),
> etc.
> But, this is costly when something wants to visit many terms but pull
> metadata for only few (eg respelling, certain MTQs).  This is
> particularly costly for sep codec because it has more metadata to
> store, per term.
> So instead I think we should block-encode all terms between indexed
> term, so that the metadata is stored "column stride" instead.  This
> makes it faster to enum just terms.

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