FoundationDB (next)

En 2018, Apple open-source une base de donnée qu'elle a racheté quelques années avant. Qu'est ce qui se cache derrière ce nom faramineux?! Quand et pourquoi utiliser cette base de données? Quelles sont les connaissances requises pour démarrer la programmation avec FoundationDB?

Transcript

1. FoundationDB A database to rule them all
2. What? Who? Why? When? How? What is FoundationDB? Who use FoundationDB? Why and when to use FoundationDB? How to program FoundationDB?
3. What is FoundationDB? jespen.io + simulation tested ⇒ ACID predictable ⇒ C(A)P reasonably scalable ⇒ Ordered Key-Value Store ⇒ versatile
4. Who use FoundationDB? Apple IBM (via CouchDB) Uber Goldman Sachs VMware Ebay (via JanusGraph) ...
5. Why and When to use FoundationDB? Need more than 1 TB? Need Fault Tolerance? Need Replication? Have money to spare? Want to have fun?!
6. When not to use FoundationDB? When SQLite LSM extension is enough? When MongoDB WiredTiger is not free anymore?! When you understand Facebook RocksDB API? When Google LevelDB is fast enough? (Oracle Berkeley Database)
7. How to program FoundationDB? (1/5) Ordered Key Value Store = Lexicographic Order = Natural Language Dictionary Order = 1 < 10 < 42 < “2” < “car” < “care” < “careful”
8. How to program FoundationDB? (2/5) Ordered Key Value Store = “Natural” Ordering != Insertion Order
9. from fdb import tuple # FDB manipulates bytes, but expose Python objects via fdb.tuple. expected = (42, 42.0, “\x42”, “42”, (“hello”, “world”)) assert tuple.pack(tuple.unpack(expected)) == expected # Remember that fdb.tuple will preserve natural ordering for base data types: # int, float, byte, string, tuples
10. How to program FoundationDB? (4/5) Insertion order does not matter ⇒ The key space has a predictable order ⇒ Slices of keys are predictable ⇒ One can build data-structures on top ordered key-values
11. How to program FoundationDB? (5/5) Key Value (‘article’, ‘metadata’, ‘rows’) (‘title’, ‘body’) (‘article’, ‘row’, 1) (‘basic’, ‘a range is a slice’) (‘article’, ‘row’, 2) (‘idiom’, ‘read the documentation’) (‘article’, ‘row’, 3) (‘more’, ‘ranges and prefixes for the win’) (‘article’, ‘index’, ‘title’, ‘basic’) ... ... ...