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https://issues.apache.org/jira/browse/LUCENE-3531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13169232#comment-13169232
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Uwe Schindler commented on LUCENE-3531:
---------------------------------------
There is one problem with this wrapper object and WeakHashMap. The wrapped
object does not have a reference to the wrapper itsself, so the wrapper may get
garbage collected (as nothing refers to it) and the item may get removed from
the map.
So this does not work! ...digging!
> Improve CachingWrapperFilter to optionally also cache acceptDocs, if
> identical to liveDocs
> ------------------------------------------------------------------------------------------
>
> Key: LUCENE-3531
> URL: https://issues.apache.org/jira/browse/LUCENE-3531
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 4.0
> Reporter: Uwe Schindler
> Assignee: Michael McCandless
> Fix For: 4.0
>
> Attachments: LUCENE-3531-identityFix.patch,
> LUCENE-3531-identityFix.patch, LUCENE-3531.patch
>
>
> Spinoff from LUCENE-1536: This issue removed the different cache modes
> completely and always applies the acceptDocs using
> BitsFilteredDocIdSet.wrap(), the cache only contains raw DocIdSet without any
> deletions/acceptDocs. For IndexReaders that are seldom reopened, this might
> not be as performant as it could be. If the acceptDocs==IR.liveDocs, those
> DocIdSet could also be cached with liveDocs applied.
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