CAP Twelve Years Later: How the “Rules” Have

Changed

Christophe.VanGinneken@student.kuleuven.be

data

Service Access Points

Data-Centric Services

Distributed Service

data

1 accept

2 don’t

availability consistencyof service of data

enter CAP

Eric Brewer

also

SA

C A

PEventually Consistent

Sorry We’re Closed

Harry Potter Was Here

Bad Idea ?

But, what is a Partition ?

cap.key

5 minutes remaining

From ‘draft’ to ‘final’

Wait Cancel

(*) Microsoft chooses Consistency

(*)

CAP Twelve Years Later: How the “Rules” Have

Changed

Christophe.VanGinneken@student.kuleuven.be

CAP Twelve Years Later: How the “Rules” Have

Changed

T

Christophe.VanGinneken@student.kuleuven.be

CAP Fourteen Years Later: How the “Rules” Have

Changed

T

Christophe.VanGinneken@student.kuleuven.be

PNUTS

• P are rare!

• C+A until P!

• detect P explicitly!

• handle P explicitly

• limit operations!

• user interface!

• higher level of abstraction

• delayed intensions !

• logging, merging, …!

• compensate for mistakes

CAT Fourteen Years Later: Still Requires

Common Sense

Christophe.VanGinneken@student.kuleuven.be