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