The document presents a talk by Andrea Rabbaglietti on modern messaging for distributed systems, discussing key concepts like agentful vs. agentless architecture, scaling methods, and inter-process communication (IPC). It highlights the importance of managing stateless and stateful processes, as well as the use of messaging systems such as RabbitMQ and ZeroMQ. The presentation also includes real-world applications and examples, particularly referencing Facebook's actor model and its implementation using Erlang VM.

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