Orchestration
Advantage
- Easy to monitor the execution of workflows and handle task failures during workflow execution.
Disadvantage
- May suffers from performance bottlenecks
- all the data is indirectly passed between the services of the workflow resulting in unnecessary data-flows, consuming more bandwidth and hence weakening the performance of the workflow execution
- Poor scalability
- The overall performance of workflows reduces as the number of services and the volume of the data to be orchestrated in the workflow becomes larger.
Choreography
- Does not depend on the central coordinator.
- Achieves the composition by peer-to-peer communication between the services of the workflow
- Transfer data directly between them without going through any central coordinator.
- This direct data transfer between services consumes less bandwidth and thus provides performance benefits when data is intensive.
Advantage
- More scalable than orchestration approach
Disadvantage
- Difficult to handle provenance of data, monitor and handle components failures
Comparison
| Factors | Method | |
|---|---|---|
| Orchestration | Choreography | |
| Composition | Centralized | Decentralized |
| Data movement | Indirect/Centralized | Direct/Peer-to-Peer |
| Monitoring | Easy | Difficult |
| Provenance | Easy | Difficult |
| Failure-handling | Relatively easy | Difficult |
| Scalability | Not scalable | Scalable |
| Single point of failure | Possible | Not possible |
| Implementation | Simple and straight-forward | Complex |
Reference
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