Cassandra 分散データベース

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

Cassandra

decentralized

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• 7 • • IRC 100 • • 3 2 •

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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

... • • • • 1 • • • ( )

... • • •

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1: Digg Digg Alexa.com 98

• • • •

• • Cassandra •

2: Twitter Twitter 140 Alexa.com 12

Twitter

MySQL • ˜1,000,000 ops/s • • • •

3: Facebook Facebook Alexa.com 2

Inbox Search • 100TB • 160 • 1 5 2

4: Mahalo Mahalo.com Mahalo

MySQL • 1,600 • • •

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

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

http://oss.infoscience.co.jp	1595
http://192.168.0.3	4
http://webcache.googleusercontent.com	2
http://localhost	1
http://www.google.co.jp	1

Cassandra 分散データベース

by あしたのオープンソース研究所　 on Aug 31, 2010

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