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Hadoop Essentials by Swizec Teller

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The Architecture of HBase

HBase is column-oriented by design, where HBase tables are stored in ColumnFamilies and each ColumnFamily can have multiple columns. A ColumnFamily's data are stored in multiple files in multiple Regions where a Region holds the data for a particular range of row keys. To manage Regions, MasterServer assigns multiple Regions to a RegionServer. The flexibility in the design of HBase is due to the flexible RegionServers and Regions, and is controlled by a single MasterServer. HBase Architecture uses Zookeeper to manage the coordination and resource management aspects which are needed to be highly available in a distributed environment. Data management in HBase is efficiently carried out by the splitting and compaction processes ...

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