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Implementing distributed
     applications with


...and some other bad guys...
         Crippa Francesco
Scalability vs Complexity
Scalability vs Complexity

     what we want




                                      Complexity
1 Thread    2 Threads   2 Nodes   4 Nodes
Scalability vs Complexity

      reality




                                          Complexity
1 Thread        2 Threads   2 Nodes   4 Nodes
The Q in ØMQ
The Ø in ØMQ
The Ø in ØMQ

Zero Broker
The Ø in ØMQ

Zero Broker

Zero Latency (as close as possible...)
The Ø in ØMQ

Zero Broker

Zero Latency (as close as possible...)

Zero administration
The Ø in ØMQ

Zero Broker

Zero Latency (as close as possible...)

Zero administration

Zero cost
The Ø in ØMQ

Zero Broker

Zero Latency (as close as possible...)

Zero administration

Zero cost

Zero waste
Sockets
Sockets
Unicast transports (inproc, ipc, tcp)
Sockets
Unicast transports (inproc, ipc, tcp)

Multicast transports (pgm or epgm)
Sockets
Unicast transports (inproc, ipc, tcp)

Multicast transports (pgm or epgm)

connect() and bind() are independent
Sockets
Unicast transports (inproc, ipc, tcp)

Multicast transports (pgm or epgm)

connect() and bind() are independent

They are asynchronous (with queues)
Sockets
Unicast transports (inproc, ipc, tcp)

Multicast transports (pgm or epgm)

connect() and bind() are independent

They are asynchronous (with queues)

They express a certain "messaging pattern"
Sockets
Unicast transports (inproc, ipc, tcp)

Multicast transports (pgm or epgm)

connect() and bind() are independent

They are asynchronous (with queues)

They express a certain "messaging pattern"

They are not necessarily one-to-one
...and, of course...

Cross Platform (Linux, Windows, Mac, etc...)

Multiple Languages (c, c++, python, java,
ruby, erlang, php, perl, ada, c#, lua, scala,
objective-c, go, haskell, racket, cl, basic...)

OpenSource
if you have a laptop...



http://www.zeromq.org/

http://zguide.zeromq.org/
Basic Message Patterns
Server
Client
Demo
Basic Message Patterns
Server
Client
Demo
Publisher
                Subscriber
The PUB-SUB socket pair is asynchronous

when you use a SUB socket you must set a
subscription using zmq_setsockopt and
SUBSCRIBE

"slow joiner" symptom
Basic Message Patterns
Ventilator
Worker
Sink
Demo
Workers

Always synchronize the start of the batch

The ventilator's PUSH socket distributes
tasks to workers (load balancing)

The sink's PULL socket collects results from
workers evenly (fair-queuing)
Fair-Queuing
Basic Message Patterns
Send
messages
  back
Demo
Allowed Patterns

PUB and SUB         DEALER and DEALER

REQ and REP         ROUTER and ROUTER

REQ and ROUTER      PUSH and PULL

DEALER and REP      PAIR and PAIR

DEALER and ROUTER
Scalability
Scalability
Scalability
Scalability
A Publish-Subscribe Proxy
Built-in Devices


QUEUE (request-reply broker.)

FORWARDER (pub-sub proxy server)

STREAMER (like FORWARDER but for
pipeline flows)
Dynamic Scalability...
Dynamic Scalability...
              SCA   LOW
                  LAB
                       ILI
                  !!!!     TY
Dynamic Scalability...
ØMQ : Sockets = Python : C++

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Europycon2011: Implementing distributed application using ZeroMQ

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