[Hbase] Caching for read performance
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Key: HADOOP-2651
URL: https://issues.apache.org/jira/browse/HADOOP-2651
Project: Hadoop
Issue Type: Improvement
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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