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From "Marvin Humphrey (JIRA)" <>
Subject [jira] Commented: (LUCENE-831) Complete overhaul of FieldCache API/Implementation
Date Sun, 12 Apr 2009 17:02:15 GMT


Marvin Humphrey commented on LUCENE-831:

> Another thing that'd be great to fix about FieldCache is its
> intermittent checking of the "some docs had more than one token in the
> field" error.

Add a FieldType that only allows one value per document. At index-time, 
verify when the doc is added that indeed, only one value was supplied.

In Lucy, I expect StringType to fill this role. FullTextType is for multi-token

Optionally, add a "NOT NULL" check to verify that each doc supplies a
value, or allow the FieldType object to specify a default value that should
be inserted.

> Complete overhaul of FieldCache API/Implementation
> --------------------------------------------------
>                 Key: LUCENE-831
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Hoss Man
>            Assignee: Mark Miller
>             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, 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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