Outstanding Cassandra's features benefiting from masterless architecture

1. Advantages of Cassandra’s
masterless architecture
Duy Lam @ RD
KMS TechCon 2015

2. Masterless
Architecture
Cautions

3. Introduction
An Apache
Software
Foundation
project
Built on
Java
DataStax

4. Masterless
Architecture
Cautions

5. Masterless Architecture
Peer-to-peer
Database
Automatic
Data
Distribution
Built-in
Replication

6. Masterless Architecture
Cassandra cluster
Background
service
Web
service
Application
Peer-to-peer
Database
Automatic Data
Distribution
Built-in Replication
No SPOF
A node

7. Masterless Architecture
Peer-to-peer
Database
Automatic Data
Distribution
Built-in Replication
partition id name
usa_1994 ae12f… The Shawshank Redemption
usa_1994 bb2ac… Forrest Gump
skorea_2002 31dcc… The Way Home
vn_2015 890af… Jackpot
2
usa_1994 ae… The Sha..
usa_1994 bb… Forrest..
1 skorea_2002 31… The Way …
3 vn_2015 89… Jackpot
Cassandra cluster
CREATE TABLE movie (
partition text ,
id uuid,
name text
)

8. Masterless Architecture
Peer-to-peer
Database
Automatic Data
Distribution
Built-in Replication
partition id name
(A)
usa_1994 ae12f… The Shawshank Redemption
usa_1994 bb2ac… Forrest Gump
(B) skorea_2002 31dcc… The Way Home
(C) vn_2015 890af… Jackpot
2
1
3
Cassandra cluster
CREATE TABLE movie (
partition text ,
id uuid,
name text
)
(B) (A’) (C’)
(A) (B’) (C’)
(C) (A’) (B’)

9. The Advantages
Peer-to-peer
Database
Automatic Data
Distribution
Built-in
Replication
?

10. The Advantages
Peer-to-peer
Database
Automatic Data
Distribution
Built-in
Replication
High
Availability
Fault
Tolerance
Scalability

11. Demo now
Fault
Tolerance
Scalability
High
Availability

12. Masterless
Architecture
Cautions

13. Cautions
Cassandra is from NoSQL family
So
?

14. Cautions
Cassandra is from NoSQL family
So
 Different data modeling (try to google “nosql
data modeling”)
 No Atomicity for multiple tables (or
“documents”)  no transaction
 Not good at complex query (group by, having,
like, >=, etc.)

15. Cautions
CREATE TABLE movie (
partition text, id uuid,
name text, released_year int, country text,
PRIMARY KEY (partition, id)
)
Limited query capability in Cassandra
SELECT * FROM movie WHERE
release_year < 2000
name LIKE “Star Trek”
name IN ( “Tangled”, “Frozen” )
name = “Inside Out” and year = 2015
length = null
length = 120 OR release_year = 2015
UPDATE movie SET length=95 WHERE partition = “vn” AND id = 10
INSERT INTO movie(partition, id, length) VALUES(“usa”, 15, 120)
(1)
(2)
(3)
(4)
(5)
(6)

16. Cautions
CREATE TABLE movie (
partition text, id uuid,
name text, released_year int, country text,
PRIMARY KEY (partition, id)
)
Limited query capability in Cassandra
SELECT * FROM movie WHERE
release_year < 2000
name LIKE “Star Trek”
name IN ( “Tangled”, “Frozen” )
name = “Inside Out” and year = 2015
length = null
length = 120 OR release_year = 2015
UPDATE movie SET length=95 WHERE partition = “vn” AND id = 10
INSERT INTO movie(partition, id, length) VALUES(“usa”, 15, 120)
(1)
(2)
(3)
(4)
(5)
(6)

17. References
DataStax Cassandra Tutorials
https://www.youtube.com/playlist?list=PL3E5AC388940EEC0A
(thanks to Provision feature) Launch
Cassandra clustering system at
http://bit.ly/kms-techcon2015-cassandra-demo

18. Take Away
Masterless Architecture
– Peer-to-peer Database
– Automatic Data Distribution
– Built-in Replication
Cautions
– Cassandra is from NoSQL family
– Limited query capability

19. THANKS YOU