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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-831) Complete overhaul of FieldCache API/Implementation
Date Wed, 14 Mar 2007 07:26:09 GMT
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



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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