a distributed framework for reliable and efficient service choreographies young yoon, chunyang ye...
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A Distributed Framework for Reliable and Efficient Service
Choreographies
Young Yoon, Chunyang Ye and Hans-Arno Jacobsen
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What is service choreography?
Autonomous and distributed collaborationamongst independently developed services.
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Service choreographyExample: Credit card fraud detection process
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Auditing partner sends fraud warnings to Accounting partnerG0
G1Customer service issues refund to
Customer
Young Yoon
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Auditing partner sends fraud warnings to Accounting partnerG0
G1Customer service issues refund to
Customer
Decompose
Send fraud warning
messages
Receive fraud warning message
Issue refund Receive refund
message
Auditing service Accounting service CRM service Client serviceYoung Yoon
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L0 L0 L0 L0
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Semantic conflictBehavior that does not conform to the collaboration specification
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Send fraud warning
messages
Receive fraud warning message
Issue refund Receive refund
message
Auditing service Accounting service CRM service Client service
“ Someone used my credit card to purchase train ticket!”
Issue refund
Refund
Customer account
CRM service behavedarbitrarily and causedsemantic conflict.
Young Yoon
Travel agency
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Auditing partner sends fraud warnings to Accounting partnerG0
G1Customer service issues refund to
Customer
Gx
Accounting partner orders customer service to issue refund
The cause of the semantic conflictThe missing synchronization
Young Yoon
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Another example: Internal operation in a car company
HQ ”clear out” Dealer
Operations manager “decrease production rate”
change to Factory
Marketing “Sales trend update”
Factory
Dealers ask Coordinator to pick G1 or G2
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Goal 1: Prevent semantic conflict. Enrich safety constraints
Goal 2: Build a distributed frameworkGovern the enforcement of safety constraints
Goal 3: Make the framework be efficient Don’t let the safety constraints hamper the performance of the collaboration
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Goal 1: Prevent semantic conflictGoal 2: Build a distributed frameworkGoal 3: Make the framework be efficient
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Enrich safety constraints during the decomposition.
Young Yoon
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r1 r2m1
r3 r4m2 r1 r5
m3
r1 r3m4
G1
G2
G4
G3
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rx: collaborating partner x
r1 r2m1 : r1 sends m1 r2
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r1 r2m1
r3 r4m2 r1 r5
m3
r1 r3m4
r2 r3c1 r2 r1
c2
r4 r1c3 r5 r1
c4
G1
G2
G4
G3
r1 r2m1
r3 r4m2 r1 r5
m3
r1 r3m4
G1
G2
G4
G3
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(G1) : projection of G1
x(m1): send m1
x(m1): receive m1
r1 r2m1
r3 r4m2 r1 r5
m3
r1 r3m4
r2 r3c1 r2 r1
c2
r4 r1c3 r5 r1
c4
G1
G2
G3
G3
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x(m1)(G1)
r1
r1 r2m1
r3 r4m2 r1 r5
m3
r1 r3m4
r2 r3c1 r2 r1
c2
r4 r1c3 r5 r1
c4
G1
G2
G3
G3
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x(m1)(G1)
x(c3)(G2)
r1
r1 r2m1
r3 r4m2 r1 r5
m3
r1 r3m4
r2 r3c1 r2 r1
c2
r4 r1c3 r5 r1
c4
G1
G2
G4
G3
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x(m1)
x(m4)
(G1)
x(c3)(G2)
(G4)
r1
r1 r2m1
r3 r4m2 r1 r5
m3
r1 r3m4
r2 r3c1 r2 r1
c2
r4 r1c3 r5 r1
c4
G1
G2
G4
G3
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x(m1)
x(m4)
(G1)
x(c3) x(c2)(G2)
(G4)
(G1)
r1
r1 r2m1
r3 r4m2 r1 r5
m3
r1 r3m4
r2 r3c1 r2 r1
c2
r4 r1c3 r5 r1
c4
G1
G2
G3
G3
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x(m1)
x(m4)
x(m3)
(G1)
x(c3) x(c2)(G2)
(G4)
(G1)
(G3)
r1
r1 r2m1
r3 r4m2 r1 r5
m3
r1 r3m4
r2 r3c1 r2 r1
c2
r4 r1c3 r5 r1
c4
G1
G2
G3
G3
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x(m1)
x(m4)
x(m3)
(G1)
x(c3) x(c2)(G2)
(G4)
(G1)
(G3)
r1
x(c4) (G3)
r1 r2m1
r3 r4m2 r1 r5
m3
r1 r3m4
r2 r3c1 r2 r1
c2
r4 r1c3 r5 r1
c4
G1
G2
G3
G3
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Send fraud warning
messages
Receive fraud warning message
Issue refund Receive refund
message
Auditing service
Accounting service
CRM service Client service
Receive confirmation
Send confirmation
Revisiting the credit card fraud detectionprocess
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Decomposition overhead
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Task increase per partner
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Goal 1: Prevent semantic conflictGoal 2: Build a distributed frameworkGoal 3: Make the framework be efficient
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B
B
B
B
B
B
LP
CA
CA
CA
BLP
LP
Coordinator
CoordinatorConstraint Deployer
CA LP
LP (Sub-constraints):Local Process
CA:Choreography Agent B: Pub/Sub Broker
LP
LP
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SSS
S
SS
S
SS
S S
SS
S
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B
B
B
B
B
B
LP
CA
CA
CA
BLP
LP
Coordinator
CoordinatorConstraint Deployer
CA LPLP (Sub-constraints):Local ProcessCA:Choreography Agent
B: Pub/Sub Broker
Process Instance Initializer
Local Process
Interpreter
Choreography Message
Generator
LP
LP
Choreography Message Listener
Pub/Sub Translator
Pub/Sub Communication Interface CA /
Coo
rdin
ator
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Coordination overhead
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Scalability
60% ↑
14% ↑
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Goal 1: Prevent semantic conflict.Goal 2: Build a distributed framework.Goal 3: Make the framework be efficient.
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Minimize the coordination overhead.
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Distance from candidate location to task ri
Weight: Execution time of task ri
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r1 r2m1
r3 r4m2 r1 r5
m3
r6 r7m4
G1
G2
G4
G3
r2 r8m5G5
Pick
Pick
Higher weights given to atask with more followingtasks.
There can be nested picks.Thus weights are recursivelycomputed.
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The bottom line 1:
We prevent semantic conflict even whenthe collaboration is dynamic.Because of the agent-based framework and enrichment of safety constraints during reliable decomposition.
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The bottom line 2:
Efficient and scalable enforcement of safety constraintsBecause of the novel coordinator placement method and concurrent execution of decomposed tasks through parallel and distributed choreography agents.
Young Yoon
