🏡 Back Home
🔎 Search
Consistency
Weak consistency
- After a write, reads may or may not see it
- Best effort only
- "Message in a bottle"
- App Engine: memcache
- VoIP, live online video, realtime multiplayer games - it's acceptable to loose some packets, transactions
Eventual consistency
- After a write, reads will eventually see it
- App Engine: mail
- Search engine indexing
- DNS, SMTP, snail mail
- Amazon S3, SimpleDB
Strong consistency
- Azure tables
- After a write, reads will see it
- App Engine: datastore
- File systems
- RDBMSes
#Links