Lec 1
HBase: Hadoop‘s database
For Google Big table:
3 major Dimensions: Columns, Rows, Timestamps(per value)
Column key,
HBase,bigtable(Colums oriented)
Column->Most basic unit of HBase
Timestampes->Keep different versions of data in one table in separate cells
Family of Columns-》stored in same Hfile
SYNTAX:NAME OF COLUMN KEY
family:qualifier
Row key
Rows->unit of transactional consistency
Grouping rows->tablets (Because tablets are distributed and stored close to each other->faster lookup)
原文：http://www.cnblogs.com/andromera/p/5001496.html