Download - ETALIS_DEBS_2010
Processing Out-Of-Order Event Streams in ETALIS
Paul Fodor, Darko Anicic, Sebastian Rudolph, Roland Stühmer4th ACM International Conference on Distributed Event-Based Systems (DEBS 2010), Cambridge, UK
Event Processing in ETALIS
Figure source: Tali Yatzkar & Opher Etzion, IBM Research
Knowledge-based EP
What are semantic relations between events w.r.t background knowledge?
ψ = ? π ← φ ∨ ¬ ψ. φ = true.
EP with on-the-fly knowledge evaluation and stream reasoning:
• Classification and filtering
• Context
• Intelligent recommendation
• predictive analysis
Out-of-Order Event Processing
Hedge fund with independent cooperating agents: events arrive out-of-order.
ce1 ← stock(Agent1, “GO”, Pr1,Vol1) SEQ stock(Agent2, “GO”, Pr2,Vol2) WHERE Pr1*1.20<Pr2.ce2 ← stock(Agent1, “MS”, Pr1,Vol1) SEQ stock(Agent2, “MS”, Pr2,Vol2) WHERE Pr1>1.20*Pr2.
Missing complex events due to out-of-order stream: stock(agent1, “GO”, 100,10) SEQ stock(agent2, “GO”, 125,10);
False positives complex event ce2 due to an out-of-order event.
Inference Rule Transformation
Performance Evaluation
Configuration: Pentium dual-core processor 2GHz CPU, 3GB running on Ubuntu Linux. ETALIS was run using Yap Prolog version 5.1.31.
The execution time for in-order vs. out-of-order experiments
Thank you! Questions…
ETALIS
Open source:
http://code.google.com/p/etalis
See also our Live DEMO at:
http://krake26.perimeter.fzi.de:8080/etalis
