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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-831) Complete overhaul of FieldCache API/Implementation
Date Fri, 22 Aug 2008 01:00:46 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624529#action_12624529
] 

Mark Miller commented on LUCENE-831:
------------------------------------

Deprecating the function package is problematic. Doing it by method leaves the classes open
to issues maintaining two possible states that could be mixed - the FieldCache and parsers
are used as method params - you can't really replace the old internal representation with
the new one. You really have to support the old method and new method and tell people not
to use both or something. Doing it by class means duplicating half a dozen classes with new
names. Neither is very satisfying. This stuff is all marked experimental and subject to change
though - could it just be done clean sweep style? A little abrupt but...experimental is experimental
<g>

> 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
>             Fix For: 3.0
>
>         Attachments: 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
>
>
> 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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