Apache Cassandra.
Cassandra is NoSQL persistence solustion. NoSQL persistence.
* Distributed data
* Linear scalability
* Tunable consistency level.
Developed by facebook - open sourced in 2008
Influenced by Bigtable(link) and Dynamo white(link).
Netflix, ebay, twitter, reddit.
Structure.
The data stored and replicated across nodes. node - server having cassandra instance. virtual node(one server will contain many cassandra instance). The node are distributed around a token ring. hash of the key will determines where on the token data stored.
replication strategies combined with snitch - where data to replicated. it improves availability.
Data structure.
A keyspace is the namespace under which column families are defined.The replication strategies and factors defined at keyspace level.
A column family contains a number of rows, indexed by a row key, Each row containing a collection of columns. Each column contains a column name value and time stamp.
The ordering of columns in a row is important. The datatype for column value is specified by the validator.
Column automatically expire by setting time to live. ttl has passed then column will automatically be deleted.
Cassandra is NoSQL persistence solustion. NoSQL persistence.
* Distributed data
* Linear scalability
* Tunable consistency level.
Developed by facebook - open sourced in 2008
Influenced by Bigtable(link) and Dynamo white(link).
Netflix, ebay, twitter, reddit.
Structure.
The data stored and replicated across nodes. node - server having cassandra instance. virtual node(one server will contain many cassandra instance). The node are distributed around a token ring. hash of the key will determines where on the token data stored.
replication strategies combined with snitch - where data to replicated. it improves availability.
Data structure.
A keyspace is the namespace under which column families are defined.The replication strategies and factors defined at keyspace level.
A column family contains a number of rows, indexed by a row key, Each row containing a collection of columns. Each column contains a column name value and time stamp.
The ordering of columns in a row is important. The datatype for column value is specified by the validator.
Column automatically expire by setting time to live. ttl has passed then column will automatically be deleted.
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