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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 Tue, 15 Jun 2010 13:35:29 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12878974#action_12878974
] 

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


|terms in field|facet method|pre-bytes ms|trunk+patch ms|new/old
|100000|fc|27|36|1.33
|100000|fcs|333|325|0.98
|100|fc|20|22|1.10
|100|fcs|24|25|1.04

OK - so the biggest problem area initially (bottlenecked by field cache merging) that was
55% slower is now 2% faster.

> 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,
LUCENE-2380_enum.patch, LUCENE-2380_enum.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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