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https://issues.apache.org/jira/browse/LUCENE-2474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12982761#action_12982761
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Yonik Seeley commented on LUCENE-2474:
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bq. Still, I think that using CopyOnWriteArrayList is best here.
Agree - I think we should optimize for good/correct behavior.
I'd like even more for there to be just a single CopyOnWriteArrayList per
"top-level" reader that is then propagated to all sub/segment readers,
including new ones on a reopen. But I guess Mike indicated that was currently
too hard/hairy.
The static is really non-optimal though - among other problems, it requires
systems with multiple readers (and wants to do different things with different
readers, such as maintain separate caches) to figure out what top-level reader
a segment reader is associated with. And given that we are dealing with
IndexReader instances in the callbacks, and not ReaderContext objects, this
seems impossible?
> 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, 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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