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https://issues.apache.org/jira/browse/LUCENE-6157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14263178#comment-14263178
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Robert Muir commented on LUCENE-6157:
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Is there a reason to pass readerCoreKey instead of just LeafReader?
> Add the ability to compute fine-grained statistics on the filter cache
> ----------------------------------------------------------------------
>
> Key: LUCENE-6157
> URL: https://issues.apache.org/jira/browse/LUCENE-6157
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-6157.patch
>
>
> The filter cache exposes some useful statistics about its usage, eg. hit
> count, eviction count, etc. In some cases it could be useful to give users
> the ability to compute finer-grained statistics though, for example by
> breaking up statistics by segment, index or by type of filter.
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