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https://issues.apache.org/jira/browse/LUCENE-3360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214451#comment-13214451
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Ryan McKinley commented on LUCENE-3360:
---------------------------------------

wow, lots has changed since the last patch!  I *think* all the reader/cache 
refactoring has settled down, so this would be good to get sorted soon.

I ran it through the LUCENE-3753.patch.hack.pl but there are enough changes, 
that it is significant work to resurrect from the patch; it may be more 
effective to refactor the code.

Martijn, you interested in picking this up again?  If no, i may give it a try.
                
> 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: 3.6, 4.0
>
>         Attachments: LUCENE-3360-3x.patch, LUCENE-3360-3x.patch, 
> LUCENE-3360-3x.patch, LUCENE-3360.patch, LUCENE-3360.patch, 
> LUCENE-3360.patch, LUCENE-3360.patch, LUCENE-3360.patch, LUCENE-3360.patch, 
> 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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