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https://issues.apache.org/jira/browse/HBASE-2253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837417#action_12837417
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Jean-Daniel Cryans commented on HBASE-2253:
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One point of discussion here is whether we should only show the hit rate for
cacheBlocks=true or both.
> 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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