Cluster: Cassandra is designed to be distributed over several nodes/machines. A cluster consists of several nodes. I've only ever used Cassandra in a single node which is my computer.
Keyspace: A cluster consists of several keyspaces. Keyspace is the place where our data reside. A keyspace could have several Column Family or Super Column Family.
Column Family and Super Column Family: Both Column Family and Super Column Family is a collection of rows, just like a table is a collection of rows in relational database.
Row: A row consists of columns; key-value columns for a row in Column Family, or Super Columns for a row in Super Column Family.
Super Column: It is sort of container of sub-columns (which are of type Key-value Column).
Key-value Column: The most basic data structure in Cassandra where the actual data is saved as byte. The behavior is a lot like Java Hash data type.
Here are examples of Cassandra data retention and retrieval:
COLUMN_FAMILY_NAME[ROW_KEY_NAME][COLUMN]
User['user1']['name'] = 'Rochmat Santoso';
User['user1']['address'] = 'Surabaya';
User['user2']['name'] = 'Barbie';
User['user2']['address'] = 'Malibu';
SUPER_COLUMN_FAMILY_NAME[ROW_KEY_NAME][SUPER_COLUMN_NAME][COLUMN]
Province['province1']['info']['name'] = 'East Java';
Province['province1']['info']['capital'] = 'Surabaya';
Province['province1']['city']['sby'] = 'Surabaya';
Province['province1']['city']['mlg'] = 'Malang';
Province['province1']['city']['sda'] = 'Sidoarjo';
Province['province2']['info']['name'] = 'West Java';
Province['province2']['info']['capital'] = 'Bandung';
Province['province2']['city']['bdg'] = 'Bandung';
Province['province2']['city']['tgr'] = 'Tangerang';
