On the Support of Scientific Workflows over Pub/Sub Brokers

Abstract

The execution of scientific workflows is gaining importance as more computing resources are available in the form of grid environments. The Publish/Subscribe paradigm offers well-proven solutions for sustaining distributed scenarios while maintaining the high level of task decoupling required by scientific workflows. In this paper, we propose a new model for supporting scientific workflows that improves the dissemination of control events. The proposed solution is based on the mapping of workflow tasks to the underlying Pub/Sub event layer, and the definition of interfaces and procedures for execution on brokers. In this paper we also analyze the strengths and weaknesses of current solutions that are based on existing message exchange models for scientific workflows. Finally, we explain how our model improves the information dissemination, event filtering, task decoupling and the monitoring of scientific workflows.

From event streams to process models and back: Challenges and opportunities

“…Besides this, Appel et al [107] also propose a similar marking for the completion of the entire process instance. Morales et al [110] use control events and a coordinator function which monitors the execution of activities and the set of enabled activities.…”

“…Yet, the actual actions to be taken should be defined. One example where action upon exception detection is addressed is presented by Morales et al [110], offering a basic mechanism for restoring the system and recovering from exceptions. Being generic, it does not entail compensating actions of any kind.…”

“…This, however, cannot be considered a model transformation, as the imperative model fragments are still handled by process engines rather than by the CEP engine. Morales et al [110] use a basic imperative process model mapped to a pub/sub network specification. Their model supports basic and advanced branching and merging control flow patterns.…”

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“…Second, over BLE, a Publish/Subscribe protocol will be deployed. Actually, the use of the Publish/Subscribe communication paradigm facilitates binding between data sources and consumers of data [ 76 ], as the intermediate entity called “broker” manages registration and decouples entities in time and space. This improves system architecture flexibility (which deals with REQ#4 and REQ#2), as data sources do not have to be aware of the existence or number of data consumers and vice versa .…”

Enhancing Evacuation Plans with a Situation Awareness System Based on End-User Knowledge Provision

“…In order to support various communication channels, a communication middleware must be provided. In previous work [16] we proposed a mobile middleware solution for continuous service invocation based on communication channels and a specific Publish/Subscribe network [17] to enable the loosely coupled communication.…”