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https://issues.apache.org/jira/browse/HBASE-5303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196564#comment-13196564
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Zhihong Yu commented on HBASE-5303:
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Interesting idea.
We need to define (pluggable) policies that help us determine the hotness of
rows.
> Separate out rows into multiple files during compaction for better block
> cache utilization
> ------------------------------------------------------------------------------------------
>
> Key: HBASE-5303
> URL: https://issues.apache.org/jira/browse/HBASE-5303
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> This seems odd at first sight, a compaction is supposed to reduce the number
> of files. But there is great advantage to creating hbase blocks where
> adjacent keys are accessed together. One approach would be to make compaction
> write out hot-rows into one file and the cold-rows into another file. This
> increases the efficiency of the block cache because only the blocks in the
> hot-rows file will most frequently be populated in the block cache.
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