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https://issues.apache.org/jira/browse/HBASE-2253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837425#action_12837425
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ryan rawson commented on HBASE-2253:
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when in doubt... do both things!
> Show Block cache hit ratio for requests where cacheBlocks=true
> --------------------------------------------------------------
>
> Key: HBASE-2253
> URL: https://issues.apache.org/jira/browse/HBASE-2253
> Project: Hadoop HBase
> Issue Type: Improvement
> Reporter: Dave Latham
> Priority: Minor
>
> We've been disabling block caching for MR jobs and other big scans. It seems
> to improve cache performance, but it's difficult to measure the hit ratio
> because even scans that don't cache blocks still request blocks from the
> cache (which is good), and those requests affect the hit/miss stats, which
> makes it difficult to see how the queries where cacheBlocks=true are
> performing.
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