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https://issues.apache.org/jira/browse/SOLR-9506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15585683#comment-15585683
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Yonik Seeley commented on SOLR-9506:
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"Right... the core cache key does not change, even if there are deletes for the
segment."
So the cache key ignores deleted documents, while the value being cached does
not. It's a fundamental mis-match.
> cache IndexFingerprint for each segment
> ---------------------------------------
>
> Key: SOLR-9506
> URL: https://issues.apache.org/jira/browse/SOLR-9506
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Noble Paul
> Attachments: SOLR-9506.patch, SOLR-9506.patch, SOLR-9506_POC.patch
>
>
> The IndexFingerprint is cached per index searcher. it is quite useless during
> high throughput indexing. If the fingerprint is cached per segment it will
> make it vastly more efficient to compute the fingerprint
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