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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3360) Move FieldCache to IndexReader
Date Fri, 05 Aug 2011 03:03:28 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13079771#comment-13079771
] 

Hoss Man commented on LUCENE-3360:
----------------------------------

See also...

* LUCENE-831 - the first issue (i know of) to discuss flipping the relationship between FieldCache
and IndexReader (but got hung up on other things, particularly how reopen would affect this)
* LUCENE-1785 - where thought was put into how to merge FieldCaches when Segments are merged
* LUCENE-2665 - where a lot of work was already done to think about the "right" FieldCache
API


> Move FieldCache to IndexReader
> ------------------------------
>
>                 Key: LUCENE-3360
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3360
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Martijn van Groningen
>             Fix For: 3.4, 4.0
>
>         Attachments: LUCENE-3360.patch
>
>
> Move the static FieldCache.DEFAULT field instance to atomic IndexReaders, so that FieldCache
insanity caused by the WeakHashMap no longer occurs.
> * Add a new method to IndexReader that by default throws an UOE:
> {code}public FieldCache getFieldCache(){code}
> * The SegmentReader implements this method and returns its own internal FieldCache implementation.
This implementation just uses a HashMap<Entry<T>,Object>> to store entries.
> * The SlowMultiReaderWrapper implements this method as well and basically behaves the
same as the current FieldCacheImpl.
> This issue won't solve the insanity that comes from inconsistent usage of a single field
(for example retrieve both int[] and DocTermIndex for the same field). 

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