[HBASE-362] [Hbase] Caching for read performance

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Assignee: Unassigned
• Reporter: Edward J. Yoon
• Created: 18/Jan/08 01:25
• Updated: 04/Feb/08 18:41
• Resolved: 18/Jan/08 01:32

Description

• 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

Issue Links

• duplicates: HBASE-288 Add in-memory caching of data