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https://issues.apache.org/jira/browse/LUCENE-831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674255#action_12674255
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Michael McCandless commented on LUCENE-831:
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bq. Are there still things planned for this issue now that LUCENE-1483 has been
committed?
Good question... I think it'd still be nice to 1) have the IndexReader
expose the API for accessing the FieldCache values, 2) allow for
customization of the caching policy.
Though maybe we should hold off on those changes until we do
LUCENE-1231 (column stride fields), which I think would use exactly
the same API with the only difference being whether under-the-hood
there was a more efficient (column-stride storage) representation for
the field values vs the slower uninvert & resort (for StringIndex)
approach that FieldCache does today.
Also, in the new API I'd like to make it not-so-easy to materialize
the full array. I think it's OK to ask for the full array of a
sub-reader, but if you want to access @ the MultiReader level, we
should encourage either random access getX(int docID), iteration or
get-sub-arrays and append yourself.
> 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: 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
>
>
> 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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