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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2380) Add FieldCache.getTermBytes, to load term data as byte[]
Date Thu, 03 Jun 2010 23:48:02 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12875368#action_12875368
] 

Yonik Seeley commented on LUCENE-2380:
--------------------------------------

I just committed a patch that helps... when merging the fieldcaches,  instead of looking up
the term for each comparison, it's now stored in the segment data structure.

Per-segment faceting is now 26% slower for the 100,000 term field, and 17% slower for the
100 term field.

One way to regain more performance is to implement some kind of stateful iterator over the
values in the field cache entry instead of looking up by ord each time.

> Add FieldCache.getTermBytes, to load term data as byte[]
> --------------------------------------------------------
>
>                 Key: LUCENE-2380
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2380
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 4.0
>
>         Attachments: LUCENE-2380.patch, LUCENE-2380.patch, LUCENE-2380.patch, LUCENE-2380.patch
>
>
> With flex, a term is now an opaque byte[] (typically, utf8 encoded unicode string, but
not necessarily), so we need to push this up the search stack.
> FieldCache now has getStrings and getStringIndex; we need corresponding methods to load
terms as native byte[], since in general they may not be representable as String.  This should
be quite a bit more RAM efficient too, for US ascii content since each character would then
use 1 byte not 2.

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