Il message-passing per più di dieci anni è stata la soluzione di riferimento per affrontare le sfide e l'implementazione di un sistema distribuito: problemi di rete, forte accoppiamento fra nodi, eterogeneità delle applicazioni (diversi linguaggi di programmazione). Questo talk tratterà le soluzioni per costruire un'architettura orientata ai servizi (SOA) ed effettuare message-passing in maniera performante ed affidabile; ripercorreremo insieme i concetti e le tecnologie principali che sono alla base dei sistemi distribuiti.

1. Modern Messaging for
Distributed Systems
Andrea Rabbaglietti

3. Agenda
● Who funk is Andrea Rabbaglietti
● Disclaimer
● Pre-requisites
○ Agentful vs. Agentless
○ Scale Up Vs. Scale Out
○ Sync Vs. Async
● IPC / Language interoperability
● Channel
○ HTTP RESTful
○ Custom
● Use Case: Facebook
● One (working & in-production) example

4. Who funk is Andrea Rabbaglietti
● Computer Science @ DIB alumnus
● ex-CTO Bauzaar.it
● co-founder Serverable.io
● founder JetDeploy.io
● Django Framework contributor
● Software/System Engineer
● Business coach & tutor

5. Context

6. Disclaimer
Beware!
Success..

7. Pre-requisites
Scaling
Stateless
Vs. Stateful
Async vs.
Sync
IPC

8. Scalability

9. Scale up
● Make a single node as fast as possible
● Increase clock speed
● Add RAM
● Make disk I/O go faster

10. Scale out
● Make many nodes work together
● Manage the distributed nodes
● Let the system be fault-tolerant
● Learn how to divide your problems into
independent subproblems
But is that
possible?

11. Stateful Vs. Stateless
class MyClass:
i = 12345
def f(self):
return 'hello world: ' + self.i
class MyClass:
def f(self):
i = 1234
return 'hello world: ' + self.i

12. Stateless
sessions
in-memory
cache

13. Stateful

14. Sync Vs. Async

15. programs have an inherent attribute:
each line executes in order
Sync

16. Async

17. Async could reveal HELL

19. Inter-process Communication (IPC)
● File (or memory-mapped file)
● Signal (kill)
● Socket (unix socket)
● Message queue
● Pipe
● Shared Memory
● Message passing
Legenda:
Most operating-systems
POSIX only

20. Language Interoperability

21. ○ RabbitMQ
○ ZeroMQ
○ Apache Thrift

22. Facebook

23. Actor Model
Erlang VM
User (you..)
a2 a2
a3
a4
a5
a1
Java

24. Actor Model (2)
● No shared state
● Lightweight processes
● Asynchronous message-passing
● Mailboxes to buffer incoming messages

25. JetDeploy.io

26. Q & A

27. thank you so
much guys
Andrea Rabbaglietti
rabbagliettiandrea@gmail.com
GIT repo @
https://github.com/silverfix/gdgipc