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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-831) Complete overhaul of FieldCache API/Implementation
Date Mon, 13 Apr 2009 00:53:14 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uwe Schindler updated LUCENE-831:
---------------------------------

    Attachment: LUCENE-831-trieimpl.patch

I did some tests with the new API and TrieRange. Without patch it did not work because the
missing StopFillCacheException (but this was intended, as it was only a hack).

I created a TrieValueSource, that is similar like the UninversionValueSource, but iterates
only over shift=0 prefix encoded values.

The original patch only missed the following ctor of SortField:
{code}
  public SortField (String field, int type, ValueSource valueSource, boolean reverse) {
    initFieldType(field, type);
    this.reverse = reverse;
    this.valueSource = valueSource;
  }
{code}

After adding this, it worked (this ctor creates a "normal" sortfield but without custom comparator,
but with a specific value-source). This ctor would replace the deprecated parser ctor.

> 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-trieimpl.patch, 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, 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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