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From "Earwin Burrfoot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-831) Complete overhaul of FieldCache API/Implementation
Date Sun, 12 Apr 2009 16:16:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12698233#action_12698233
] 

Earwin Burrfoot commented on LUCENE-831:
----------------------------------------

bq. I guess you would just have to set a TrieEnabledValueSource when creating your IndexReaders?
I suppose it could extend UninversionValueSource and for given fields do Trie unencoding,
uninverting, and all other fields, yeld to the super impl?
And then if you get some other XXX encoding, you'll end up with XXXVS extends UVS, TrieVS
extends UVS, XXXAndTrieVS extends XXXVS or TrieVS + duplicate code from the other one. Ugly.

> Complete overhaul of FieldCache API/Implementation
> --------------------------------------------------
>
>                 Key: LUCENE-831
>                 URL: https://issues.apache.org/jira/browse/LUCENE-831
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Hoss Man
>            Assignee: Mark Miller
>             Fix For: 3.0
>
>         Attachments: ExtendedDocument.java, fieldcache-overhaul.032208.diff, fieldcache-overhaul.diff,
fieldcache-overhaul.diff, LUCENE-831.03.28.2008.diff, LUCENE-831.03.30.2008.diff, LUCENE-831.03.31.2008.diff,
LUCENE-831.patch, LUCENE-831.patch, LUCENE-831.patch, LUCENE-831.patch, LUCENE-831.patch,
LUCENE-831.patch, LUCENE-831.patch, LUCENE-831.patch
>
>
> Motivation:
> 1) Complete overhaul the API/implementation of "FieldCache" type things...
>     a) eliminate global static map keyed on IndexReader (thus
>         eliminating synch block between completley independent IndexReaders)
>     b) allow more customization of cache management (ie: use 
>         expiration/replacement strategies, disk backed caches, etc)
>     c) allow people to define custom cache data logic (ie: custom
>         parsers, complex datatypes, etc... anything tied to a reader)
>     d) allow people to inspect what's in a cache (list of CacheKeys) for
>         an IndexReader so a new IndexReader can be likewise warmed. 
>     e) Lend support for smarter cache management if/when
>         IndexReader.reopen is added (merging of cached data from subReaders).
> 2) Provide backwards compatibility to support existing FieldCache API with
>     the new implementation, so there is no redundent caching as client code
>     migrades to new API.

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