Apache Cassandra

Transcript

1. Apache Cassandra
3. Features • NoSQL • Lightweight • Open-source • Non-relational • Fault Tolerant • Horizontally scalable • Highly available • Configurable Consistency
4. Cassandra Scales Horizontally
5. Data is Distributed
6. Data is Distributed
7. Partitioning
8. Data is Replicated A replication factor of three ensures that there are three nodes (replicas) covering that particular token range.
9. CAP Theorem In the distributed environment, you have only two guaranteed qualities out of three :(
10. Is Cassandra AP or CP? Cassandra is configurable consistent. In any moment of the time for any particular query you can set the Consistency Level you require to have. Cassandra Consistency Levels: • ANY • ONE • TWO • THREE • QUORUM • ALL
11. Consistency Level One ✔ Client Write CL = ONE RF = 3
12. Consistency Level Quorum ✔ Client Write CL = Quorum RF = 3 ✔
13. Consistency Level ALL ✔ Client Write CL = ALL RF = 3 ✔ ✔
14. Data Distributed Everywhere Geographic Distribution Hybrid-Cloud and Multi-Cloud
15. Keyspaces CREATE KEYSPACE financial_data WITH replication = { 'class': 'SimpleStrategy', 'replication_factor': 2 }; replication factor keyspace replication strategy
16. Creating a Table in CQL CREATE TABLE financial_data.financial_transactions ( timestamp TIMESTAMP, from_bank TEXT, from_account TEXT, to_bank TEXT, to_account TEXT, amount_received DECIMAL, receiving_currency TEXT, amount_paid DECIMAL, payment_currency TEXT, payment_format TEXT, is_laundering BOOLEAN, PRIMARY KEY ((from_bank, to_bank), timestamp, payment_currency, is_laundering) ); keyspace table primary key partition key clustering columns
17. Primary Key An identifier for a row. Consists of at least one Partition Key and zero or more Clustering columns. MUST ENSURE UNIQUENESS. MAY DEFINE SORTING. PRIMARY KEY ((from_bank, to_bank), timestamp, payment_currency, is_laundering) Primary key Partition key Clustering columns
18. Partition Key An identifier for a partition. Consists of at least one column, may have more if needed PARTITION ROWS. PRIMARY KEY ((from_bank, to_bank), timestamp, payment_currency, is_laundering) Partition key
19. Clustering Column(s) Used to ensure uniqueness and sorting order. Optional. PRIMARY KEY ((from_bank, to_bank), timestamp, payment_currency, is_laundering) Clustering columns
20. Cassandra use-cases