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https://issues.apache.org/jira/browse/LUCENE-3360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214565#comment-13214565
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Robert Muir commented on LUCENE-3360:
-------------------------------------
FieldCache only takes AtomicReader now... so the insanity trap is already
removed in trunk.
We have alternative ways to 'fieldcache' at index-time, by using SortedBytes
docvalues field.
I was originally skeptical of SortedBytes (especially given its initial impl
problems), but its
been cleaned up a lot recently, I think its the direction should really move
forwards to.
There is also progress on more efficient implementations by doing more at
indexing time: e.g.
LUCENE-3729
As an "index" the idea is to compute things up-front so that searches are
faster: I don't
think lucene core needs to support 'uninverting at runtime' ?!
So I think we should start a plan for how FieldCache can be moved to contrib or
deprecated instead.
> 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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