Dear Wiki user, You have subscribed to a wiki page or wiki category on "Lucene-hadoop Wiki" for change notification. The following page has been changed by JimKellerman: http://wiki.apache.org/lucene-hadoop/Hbase/HbaseArchitecture The comment on the change is: Conceptual table view ------------------------------------------------------------------------------ [[Anchor(schema)]] = Configuration / Schema Definition = + Conceptually a table may be thought of a collection of rows that + are located by a row key (and optional timestamp) and where any column + may not have a value for a particular row key (sparse). For example: + + ||<:|2> '''Row Key''' ||<:|2> '''Time Stamp''' ||<:|2> '''Column''' ''"contents:"'' |||| '''Family''' ''"anchor:"'' || + ||<:> '''key''' ||<:> '''value''' || + ||<^|5> "com.cnn.www" ||<:> t9 || ||<)> "cnnsi.com" ||<:> "CNN" || + ||<:> t8 || ||<)> "my.look.ca" ||<:> "CNN.com" || + ||<:> t6 ||<:> "..." || || || + ||<:> t5 ||<:> `"..."` || || || + ||<:> t3 ||<:> `"..."` || || || + + ''still to come: how tables are physically stored'' + * Tablet Size * Columns are organized into Locality Groups. Separate SSTable(s) are generated for each locality group in each table. * Access Control