Cassandra 分散データベース

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Eric Evansさんの「Slideshow from Cassandra presentation @ FOSDEM 2010」の日本語訳です。

Technology

Cassandra

Eric Evans
eevans@rackspace.com
@jericevans

FOSDEM
2010 2 7

Japanese translation by http://oss.infoscience.co.jp/

Cassandra ...

• O(1) DHT ( )
• (Eventual consistency)
•

• get():
• multiget():
• get slice():
•
•
• multiget slice():

• get count:
• get range slice():

• TimeUUID
• LexicalUUID
• UTF8
• Long
• Bytes
• ...

• insert(): / ( )
• batch insert(): / ( )
• remove():
• batch mutate(): batch insert()
(0.6 batch insert() )
•

(Consistency)

CAP (Consistency) (Availability)
(Partition tolerance) 2
• Zero
• One
• Quorum ((N / 2) + 1)
• All

API

• Thrift (12 )
• Ruby
• http://github.com/fauna/cassandra/tree/master
• http://github.com/NZKoz/cassandra object/tree/master
• Python
• http://github.com/digg/lazyboy/tree/master
• http://github.com/driftx/Telephus/tree/master (Twisted)
• Scala
• http://github.com/viktorklang/Cassidy/tree/master
• http://github.com/nodeta/scalandra/tree/master

MySQL (50GB)

• MySQL
• 300ms
• 350ms

• Cassandra
• 0.12ms
• 15ms

0.6

• batch mutate
•
• ANY
•
• I/O 64 jvm
• HH
•
•
•
•

0.7

•
•
• SSTable
• SSTable
•
•
• remove key range
•
•

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Cassandra 分散データベース

1. Cassandra Eric Evans eevans@rackspace.com @jericevans FOSDEM 2010 2 7 Japanese translation by http://oss.infoscience.co.jp/

2. Cassandra

3. decentralized

4. 1 .. .. 2 3 .. 4 ..

8. • 7 • • IRC 100 • • 3 2 •

9. 1 .. .. 2 3 .. 4 ..

10. Cassandra ... • O(1) DHT ( ) • (Eventual consistency) •

11.

12. ... • • / • ( )

13.

14.

15. • get(): • multiget(): • get slice(): • • • multiget slice(): • get count: • get range slice():

16. • TimeUUID • LexicalUUID • UTF8 • Long • Bytes • ...

17. • insert(): / ( ) • batch insert(): / ( ) • remove(): • batch mutate(): batch insert() (0.6 batch insert() ) •

18. (Consistency) CAP (Consistency) (Availability) (Partition tolerance) 2 • Zero • One • Quorum ((N / 2) + 1) • All

19. API • Thrift (12 ) • Ruby • http://github.com/fauna/cassandra/tree/master • http://github.com/NZKoz/cassandra object/tree/master • Python • http://github.com/digg/lazyboy/tree/master • http://github.com/driftx/Telephus/tree/master (Twisted) • Scala • http://github.com/viktorklang/Cassidy/tree/master • http://github.com/nodeta/scalandra/tree/master

20. MySQL (50GB) • MySQL • 300ms • 350ms • Cassandra • 0.12ms • 15ms

21.

22. ... • • • • 1 • • • ( )

23.

24. ... • • •

25. 1 .. .. 2 3 .. 4 ..

26. 1: Digg Digg Alexa.com 98

27. Digg

28. • • • •

29. • • Cassandra •

30. 2: Twitter Twitter 140 Alexa.com 12

31. Twitter