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https://issues.apache.org/jira/browse/LUCENE-2474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12978982#action_12978982
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Yonik Seeley commented on LUCENE-2474:
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> > But: I think we'd want to have composite reader just forward the
> registration down to the atomic readers? (And, forward on reopen).
+1
> >I am not sure that you would want to do it.
So a user doesn't have to walk the tree and re-register it's listeners with
every new segment on a reopen.
> Any caching layer or an external component that is properly written would
> work on the low level segment readers
It's completely proper to cache stuff wrt the top level reader - Solr does so
(and will continue to provide that option) . Some people update their index
infrequently, and the performance gains of having cached information on a
unified view of the index is a win for them.
> Allow to plug in a Cache Eviction Listener to IndexReader to eagerly clean
> custom caches that use the IndexReader (getFieldCacheKey)
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2474
> URL: https://issues.apache.org/jira/browse/LUCENE-2474
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Reporter: Shay Banon
> Attachments: LUCENE-2474.patch
>
>
> Allow to plug in a Cache Eviction Listener to IndexReader to eagerly clean
> custom caches that use the IndexReader (getFieldCacheKey).
> A spin of: https://issues.apache.org/jira/browse/LUCENE-2468. Basically, its
> make a lot of sense to cache things based on IndexReader#getFieldCacheKey,
> even Lucene itself uses it, for example, with the CachingWrapperFilter.
> FieldCache enjoys being called explicitly to purge its cache when possible
> (which is tricky to know from the "outside", especially when using NRT -
> reader attack of the clones).
> The provided patch allows to plug a CacheEvictionListener which will be
> called when the cache should be purged for an IndexReader.
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