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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HADOOP-2651) [Hbase] Caching for read performance
Date Fri, 18 Jan 2008 01:32:34 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jim Kellerman resolved HADOOP-2651.
-----------------------------------

    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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