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Skaliranje distribuiranih aplikacija uz pomoć AMQP-a
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Goran Jurić
October 26, 2013
Programming
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Skaliranje distribuiranih aplikacija uz pomoć AMQP-a
Goran Jurić
October 26, 2013
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Transcript
Skaliranje distribuiranih aplikacija uz pomoć AMQP-‐a Goran
Jurić Webcamp, Zagreb, 2013.
Problem • razmjena podataka između različitih sustava i platformi
• deseci tisuća poruka / sekundi • asinkrono (fire & forget)
Riješenje? • SOAP, REST ? – Ne postoji nativni queing
mehanizam – Zahtijeva poslužitelj na svakoj strani koja prima poruke – Tko odlučuje gdje pojedina poruka mora završiti? – blocking – Što s djelomično isporučenim porukama?
Alternative • Push vs pull • Job queueovi (dostupnost
klijenata, nedostatak naprednih mogućnosti) – Gearman – Resque – Celery – ...
AMQP • Advanced Message Queuing Protocol • Protokol za
razmjenu i queueing poruka • Otvoren standard • OASIS (v1.0)
Tko koristi AMQP • Njemačka burza • JPMorgan •
NASA • RedHat • VMWare • Mozilla • AT&T • NASA • Openstack • Google
Software • Serveri – SwiftMQ – Apache QPID – Apache ActiveMQ – RabbitMQ
RabbitMQ • Erlang aplikacija • Klijenti dostupni u svim
poznatijim programskim jezicima • Web GUI plugin
Nomenklatura • Poruka • Producer • Consumer • Broker
(AMQP server)
Arhitektura
Arhitektura • Connection (TCP) – Jedna konekcija prema brokeru •
Channel – Više kanala prema Exchange-u
Broker • Exchange – Mjesto dostave poruka – Svaka poruka ima
routing ključ • Bindings – Povezuju Echange i Qeue preko binding ključa • Queue – Odredište poruka – Consumer subscribe
Exchange types • Direct • Default • Fanout •
Topic • Header
Direct Exchange • Svaka poruka ima routing ključ •
Queue X se binda na exchange koristeći ključ K • Poruka se dostavlja u Queue X ukoliko je dostavljena na zadani exchange i ima routing ključ K
Default Exchange • Default exchange nema ime • Svaki
kreirani queue je bindan na defaultni exchange preko imena queuea
Fanout Exchange • Poruka se dostavlja u svaki bindani
queue • Ignorira se routing ključ • Idealno za broadcast
Topic Exchange • Dostavlja poruku u jedan ili više
queuova u ovisnosti o routing ključu • Binding ključ – * jedna riječ – # nula ili više riječi – Bez * i # kao Direct exchange
Topic Exchange
RPC • reploy_to header • Client – Privremeni, anonimni i
ekskluzivni queue – Bez exchangea – Routing ključ = ime queue
RPC
Durability • Exchange durability • Queue durability • Message
persistence
Oprez! • Uvijek declareati exchange i queue prije slanja
ili primanja poruka • Persistentcija poruka – Klasična – Transakcijska !!! – Publisher confirm
Priprema
Publisher
Consumer
Enkodiranje poruka • binary blob • serijalizacija • JSON
• MsgPack • XML • Protocol Buffers
Ostalo • Virtual hosts • Visualiser plugin • HTTP
API • HA clustering • Flow control – Per connection – Memory – Disk
Web GUI
Alternativa AMQP-u • ZeroMQ – Low level alternativa – Web scale
(50-100x brži) – TCP sockets na steroidima
Osobna iskustva • 185 poslužitelja • ~ milijardu poruka
u zadnjih 10 mjeseci • 0 crashes • 0 downtime • 0 lost messages
Kontakt •
[email protected]
• @goran_juric