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https://issues.apache.org/jira/browse/LUCENE-2474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12978371#action_12978371
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Yonik Seeley commented on LUCENE-2474:
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There's a lot of little issues here I think:
- "close event" doesn't really describe the behavior since an event is not
generated on every close of every reader as one might expect.
- This implementation is problematic since higher level readers don't
propagate the event listeners to subreaders... i.e. I need to walk the tree
myself and add add a listener to every reader, and on a reopen() I would need
to walk the tree again and add listeners only to the new readers that have a
new coreKey.
We've talked before about putting caches directly on the readers - that still
seems like the most straightforward approach?
We really need one cache that doesn't care about deletions, and one cache that
does.
> 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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