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https://issues.apache.org/jira/browse/CASSANDRA-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13801934#comment-13801934
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Jonathan Ellis commented on CASSANDRA-3376:
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bq. we don't know how much of an sstable we'll need to read for a given slice
ahead of time
Thinking about it more, just checking the position where we start the slice
would probably be Good Enough (certainly better than nothing).
> Track buffer cache hit rate with mincore
> ----------------------------------------
>
> Key: CASSANDRA-3376
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3376
> Project: Cassandra
> Issue Type: New Feature
> Reporter: Jonathan Ellis
> Priority: Minor
> Labels: ponies
>
> We could use mincore on, say, 1% of reads to be able to report actual buffer
> cache hit rate. This would be useful when troubleshooting slow reads, e.g.,
> are reads to CF X slow because it's hitting disk, or because there are a lot
> of tombstones in the row?
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