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https://issues.apache.org/jira/browse/HADOOP-2651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jim Kellerman resolved HADOOP-2651.
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Resolution: Duplicate
> [Hbase] Caching for read performance
> ------------------------------------
>
> Key: HADOOP-2651
> URL: https://issues.apache.org/jira/browse/HADOOP-2651
> Project: Hadoop
> Issue Type: Improvement
> Components: contrib/hbase
> Reporter: Edward Yoon
> Assignee: Edward Yoon
>
> * Use two level of caching to improve read performance
> * Scan cache
> ** Higher-level cache
> *** Caches the K,V pairs returned by the SSTable(HStore?) interface to the
> region server code
> ** Most useful for applications that tend to read the same data repeatedly
> * Block cache
> ** Lower-level cache
> *** Caches SSTables blocks that were read from HDFS
> ** Useful for applications that read data close to the data that they
> recently read
> *** E.g. Sequential read or random read of different column in same locality
> group within a hot row
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