Cassandra NoSQL, NoLimits!
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Transcript of Cassandra NoSQL, NoLimits!
NoSQL
● Database● Doesn't use structure● Not Transaction● BASE● Five different types
SQL Key-value Document Column Graph
Table Bucket Collection Column Family
Vertex and Edge
Row Key/value pair
Document Column Vertex
Column Key/value pair
Key/value pair
Vertex and Edge property
Relationship Link Edge
Consistency LevelAvailability
Durability
● ANY● ONE● LOCAL_QUORON● EACH_QUORON● ALL
Gossip
Cassandra
● Commit log● Memtable● SSTable
write (k1, c1:v1)write (k2, c1:v1 C2:v2)write (k1, c1:v4 c3:v3 c2:v2)
k1 c1:v1 c2:v2 c3:v3k2 c1:v1 c2:v2
k1, c1:v1k2, c1:v1 C2:v2k1, c1:v4 c3:v3 c2:v2
k1 c1:v4 c2:v2 c3:v3k2 c1:v1 c2:v2
Cassandra● Gossip● Partitioner● Snitch● Replica placement
strategy● Seeds● Cassandra.yaml
Gossip ● The P2P protocol● Seed nodes● Each second● Start up
Partitioner
● Key based
A[0-3]
C[9-13]
D[14-18] B[4-8]
Jim Car: Camaro Age: 32
Carol Color: Pink Work: Hobby
Suzy Team: Bahia Country: USA
Jim 1
Carol 13
Suzy 15
Partitioner
● Hash da Chave● Murmur3Partitioner(default)● RandomPartitioner (MD5)● ByteOrderedPartitioner
Jim -2245462676723223822
Carol 7723358927203680754
Suzy 1168604627387940318
Murmur3 Partitioner
Replica placement strategy
● SimpleStrategy● NetworkTopologyStrategy
Write/Read
● Coordinator● BackGround● Read repair● Clock Vector
Types
● Text● Blob● Set● List● Map● uuid
Cassandra Query Language
● Drop● Insert● Update● Delete● SQL like
CREATE TABLE monkeySpecies (
species text PRIMARY KEY,
common_name text,
population varint,
average_size int
) WITH comment='Important
biological records'
AND read_repair_chance =
1.0;
SELECT name, occupation FROM users
WHERE userid IN (199, 200, 207);
UPDATE UserActions
SET total = total + 2
WHERE user =
B70DE1D0-9908-4AE3-BE34-5573E5B09F14
AND action = 'click';
DELETE FROM NerdMovies USING
TIMESTAMP 1240003134
WHERE movie = 'Serenity';
Using a user-defined typeCREATE TYPE
mykeyspace.address (
street text,
city text,
zip_code int,
phones set<text>
);
CREATE TYPE
mykeyspace.fullname (
firstname text,
lastname text
);
CREATE TABLE mykeyspace.users ( id uuid PRIMARY KEY, name frozen <fullname>, direct_reports set<frozen <fullname>>, // a collection set addresses map<text, frozen <address>> // a collection map);
Issues● Modeling● Search● Know-how● Know-why
Operations
Dev
Docker and Cassandra
https://hub.docker.com/_/cassandra/
JNoSQL
● Mapping API● Communication API● No lock-in● Divide and conquer
DAO
Mapping
Communication
DocumentKey
Column Graph
DIANA
ARTEMIS
JNoSQL
Data Tier
