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EMMA Distributed QoS-Aware MQTT Middleware for Edge Computing Applications
Thomas Rausch, Stefan Nastic, Schahram Dustdar
TU Wien Distributed Systems Group http://dsg.tuwien.ac.at
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EMMA Distributed QoS-Aware MQTT Middleware for Edge Computing - - PowerPoint PPT Presentation
EMMA Distributed QoS-Aware MQTT Middleware for Edge Computing - - PowerPoint PPT Presentation
EMMA Distributed QoS-Aware MQTT Middleware for Edge Computing Applications Thomas Rausch, Stefan Nastic, Schahram Dustdar TU Wien Distributed Systems Group http://dsg.tuwien.ac.at AWS IoT 2 Publish move x,y,z to /robot/arm Subscribe
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Subscribe to topic: /robot/arm Publish “move x,y,z” to /robot/arm
Decoupled messaging
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Trust? ! Availability? ! End-to-end latency: ??ms !
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Edge-Enabled MOM
Data centers
Internet
Mobile edge Extreme edge IoT Cloudlets Message broker Cloud-based MOM Edge-enabled MOM
Scale Proximity & Responsiveness
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▪ Popular platform for IoT
– ISO standardized pub/sub protocol – Low-bandwidth design
▪ Simple Protocol
– CONNACK – SUBSCRIBE(t), SUBACK(t) – PUBLISH(t, msg) – ...
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Static MQTT Topic Bridging
Local Broker Central Broker
Internal Topics
Static config Static config Cloud
- M. Garcia, “How to Bridge Mosquitto MQTT Broker to AWS IoT”
The Internet of Things on AWS -- Official Blog, 2016. https://aws.amazon.com/blogs/iot/how-to-bridge-mosquitto-mqtt-broker-to-aws-iot/
Edge Topic Bridge
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Goals
▪ Decentralized messaging middleware ▪ Leverages edge resources to reduce latency ▪ Can handle mobile clients ▪ Can handle volatile resources ▪ Seamlessly integrates with IoT infrastructure
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EMMA MQTT Middleware
C l i e n t GW c GW c Broker Broker D e v i c e Mo n i t
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Controller
B r i d g i n g T a b l e s
Gateway
B r i d g i n g T a b l e R e c
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fj g u r a
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i
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E n g i n e R E S T E n d p
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n t s N e t w
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k m
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i t
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B u fg e r
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t B u fg e r i n MQ T T S e r v e r D i s c
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e r y S e r v i c e
https://git.dsg.tuwien.ac.at/emma/emma
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QoS Optimization & Balancing
0-2 ms 2-5 5-10 PINGREQ PINGRESP Broker Gateway
▪ Continuously monitor network QoS via simple UDP protocol ▪ For each client create latency group to brokers ▪ Connect gateways to a broker in closest group ▪ Balance load between brokers in same group
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Orchestration
:b1: :b2: :gateway: :controller SUBSCRIBE ... CONNECT DISCONNECT replay control packets TCP connect TCP open update network RECONACK(b2) RECONREQ(b2) :brokerA :controller :gateway :client CONNACK CONNACK lookup result(brokerA) store packet CONNECT CONNECT
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Evaluation
u s
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a s t e u
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e n t r a l
Broker Gateway Broker Gateway Controller . . . . . . Gateway Broker
9 8 m s 2 7 m s 8 5 m s https://git.dsg.tuwien.ac.at/emma/pubsub-benchmark
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Controller eu-west eu-central us-east
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Controller <1 ms 98 ms 27 ms 85 ms
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Controller
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Controller
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Controller
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Controller
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Controller
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Controller
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Controller
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Message Loss
▪ Caused by subscriber mobility ▪ Guaranteed message delivery requires transactional reconnection
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More Results in the Paper
7 1 2 3 4 5 6 8
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24 Dipl.-Ing. (MSc)
Thomas Rausch
Research Assistant TU Wien Distributed Systems Group Argentinierstraße 8/194-02, 1040, Vienna, Austria T: +43 1 58801 184 838 E: t.rausch@dsg.tuwien.ac.at dsg.tuwien.ac.at/stafg/trausch
QoS Monitoring & Reconfiguration
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Related Work – P2P Pub/Sub
NCA’05 DEBS’05 MW’05 PODC’07
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State of the Art – Research
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State of the Art – The Real World
- ScalAgent. JoramMQ, a distributed MQTT broker for the Internet of Things.
White paper. 2014.