C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A dynamic reconfiguration service for CORBA. In Intl. Conf. on Configurable Dist. Systems, pages 35--42, May 1998.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....never communicate. Therefore, upgrades can change the protocols used within data centers but not those between data centers. Reconfigurable distributed systems enable the replacement of object implementations in distributed object systems, such as Argus [14] Conic [28] Polylith [26] CORBA [12, 13], and Java [38] They also let an administrator add and remove objects and change the links between them. These systems require manual upgrade scheduling and assume compatibility between versions. 9.2 State Transformation Many upgrade systems allow the transformation of state between versions ....

C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A dynamic reconfiguration service for CORBA. In 4th Intl. Conf. on Configurable Dist. Systems, 1998. 21

....the new object. This requires some form of coordination of state between the two co existing objects. Second, if an object is destroyed, any active threads within the object are lost. For this reason, clients of an object must be able to detect this broken binding and retry their request. CORBA [8], DCE [42] RMI [46] and COM [13] are all application architectures that support component replacement during program execution. However, these architectures leave the problems of quiescence and state transfer to the application, providing only the mechanism for updating client references. Pu, ....

C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A dynamic reconfiguration service for CORBA. International Conference on Configurable Distributed Systems, pages 35--42. IEEE Computer Society Press, 1998.

....between functional and structural dynamic reconfigurations [8] Functional reconfiguration involves new code being added to an application, while structural reconfiguration is topological in nature. Again, Lira supports both. Several researchers, including Almeida et al. 1] Bidan et al. [4], Kramer and Magee [18] and Wermelinger [25] have tried to address the problem of maintaining consistency during and after a reconfiguration. Usually, the consistency properties of the system are expressed through logical constraints that should be respected, either a posteriori or a priori. If ....

C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A Dynamic Reconfiguration Service for CORBA. In Proceedings of the 4th International Conference on Configurable Distributed Systems, pages 35--42. IEEE Computer Society, May 1998.

....these systems provide. They have high availability, adaptability and maintainability requirements, and, in order to remain useful, they have to cope with advances in technology, modifications of their operating environment and ever changing human needs [10] The aim of dynamic reconfiguration [8, 9, 7, 1, 4, 11, 2, 10, 14, 18] is to allow a system to evolve at ran time [8] as opposed to design time, while introducing little (or ideally no) impact on the system s execution. In this way, systems do not have to be taken off line, rebooted or restarted to accommodate changes. Changes can be classified with relation to the ....

.... a few entities result in substantial impact on the system s execution [10, 18] This approach also places a heavy burden on the application programmer who must implement all entities of the system with capabilities to act correctly to a passivate command that sets an entity to a passive state [10, 2]. In a passive state an entity shows reactive behavior. Moazami Goudarzi s approach [10] assumes that components in the system do not interleave transactions, i.e. a component participates in one transaction at a time. Therefore, it is possible to drive a component to a passive state by blocking ....

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C. Bidan, V. Issarny, T. Saridakis, A. Zarras. A dynamic reconfiguration service for CORBA, in Proc. IEEE International Conference on Configurable Distributed Systems, May 1998.

....system is determined by its downtime due to various types of maintenance. In practice, a reconfiguration implies that the system needs to be taken offline and restarted after installation of new software components. The downtime due to maintenance can be avoided by using dynamic reconfiguration [1, 3, 4, 5, 7, 9, 10 , 11 , 13 , 20 , 25], i.e. the system can be maintained or upgraded without being taken off line. The aim of dynamic reconfiguration is to allow a system to evolve at run time [9] as opposed to designtime, while introducing little (or ideally no) impact on the system s execution. In this way, the system does not ....

....be repeated for different ORB implementations to reach more conclusive results. Further tests should consider the effects of reconfiguration on the performance of the new object right after the reconfiguration, as queued requests are directed to it. 6. 3 Related work In Bidan et al. s approach [3], the implementation of a reconfiguration service in CORBA is considered. As is the case for our approach, a reconfigurable entity is a CORBA object. In this approach, the reconfiguration infrastructure maintains a representation of the configuration of the system, through a directed graph of ....

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C. Bidan, V. Issarny, T. Saridakis, A. Zarras. A dynamic reconfiguration service for CORBA, in Proc. IEEE International Conference on Configurable Distributed Systems, May 1998.

....these systems provide. They have high availability, adaptability and maintainability requirements, and, in order to remain useful, they have to cope with advances in technology, modifications of their operating environment and ever changing human needs [10] The aim of dynamic reconfiguration [8, 9, 7, 1, 4, 11, 2, 10, 14, 18] is to allow a system to evolve at run time [8] as opposed to design time, while introducing little (or ideally no) impact on the system s execution. In this way, systems do not have to be taken off line, rebooted or restarted to accommodate changes. Changes can be classified with relation to the ....

....of distributed systems to which this alternative can be applied is much more limited, since components in this approach cannot treat more than one transaction simultaneously. In a CORBA based system, this implies that re entrance and multi threading would be forbidden. In Bidan et al. s approach [2], the implementation of a reconfiguration service in CORBA is considered. The reconfigurable entity is a CORBA object and the configuration information maintained consists of a directed graph of objects connected through links. Objects A and B are said to be linked if A can invoke an operation on ....

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C. Bidan, V. Issarny, T. Saridakis, A. Zarras. A dynamic reconfiguration service for CORBA, in Proc. IEEE International Conference on Configurable Distributed Systems, May 1998.

....The leading candidate for application is CORBA, the distributed component standard, but other promising frameworks include dynamic link libraries and JavaBeans. Existing research frameworks exploring issues in distributed configurable systems may also provide good beginning foundations (e.g. [4, 26, 32, 33, 34, 38]) There are many needed directions for future work, besides the transfer to current component frameworks. These include: ffl Extending the current work to handle voting mechanisms and state computations, including global and persistent state that the component has access to. ffl Investigating ....

C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A Dynamic Reconfiguration Service for CORBA. In Proceedings of the Fourth International Conference on Configurable Distributed Systems, pages 35--42. IEEE Computer Society Press, May 1998.

....interacting with the system. Using the Lua console, it is possible to write an application from scratch and also to modify an existing one. Unplanned change can yield problems of application consistency. This problem is addressed in some works that, in general, follow the configuration paradigm [13, 22, 6]. The consistency model is based on static type checking and on a clear structural view of the application. These features do not fit in Lua dynamic style that promotes flexibility in lieu of static checking. Static solutions can avoid many runtime errors, but on the other hand limit the ....

....that can be provided [18] Thus, our work does not support the semantics of reconfiguration to verify the validity of the changes. 4.1. Reconfiguration Tasks Independently of reconfiguration classes, the operations that are typically provided by systems for reconfiguration are the same [6]: addition and removal of components and links. We next discuss how these tasks are supported in LuaSpace. The addition of new components in an application can be done: via the Lua console, automatically by the generic connector, or using conditional commands to program when the component must be ....

C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A Dynamic Reconfiguration Service for CORBA. In Proceedings of the Fourth International Conference on Configurable Distributed Systems - ICCDS, pages 35--42, Annapolis, Maryland, May 4-6 1998.

....the runtime environment. The main complication in this process is maintaining the integrity of the software system while the changes occur. Once the reconfiguration is complete, all components are activated and the operation of the system continues with the new configuration. Some approaches [1][6][17] 34] 45] 46] with a higher degree of intrusiveness require a software system to subscribe to a common component model or architectural style. In these research projects, a component must either be derived from a common base component or it must implement a specific interface or set of ....

C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. "A Dynamic Reconfiguration Service for CORBA," Proceedings of the Fourth International Conference on Configurable Distributed Systems, IEE Computer Society, May 1998, pp. 35-42.

....The leading candidate for application is CORBA, the distributed component standard, but other promising frameworks include dynamic link libraries and JavaBeans. Existing research frameworks exploring issues in distributed configurable systems may also provide good beginning foundations (e.g. [5, 26, 33, 34, 35, 39, 40]) There are many needed directions for future work, besides the transfer to current component frameworks. These include: ffl Extending the current work to handle voting mechanisms and state computations. The current prototype does not handle constraints that include the component versions state ....

C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A Dynamic Reconfiguration Service for CORBA. In Proceedings of the Fourth International Conference on Configurable Distributed Systems, pages 35--42. IEEE Computer Society Press, May 1998.

....The reconfiguration service ensures that the reconfigurations performed by handlers leave the system in a consistent 2 see http: www rocq.inria.fr solidor work aster.html. state. In our prototype, we use the reconfiguration service that we built for CORBA compliant middleware platforms [5]. This service offers a set of primitives for updating a CORBA configuration in terms of its component instances (or objects using CORBA terminology) and bindings among them, while preserving the configuration consistency. The instances embedded in the configuration and more precisely component ....

C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A dynamic reconfiguration service for CORBA. In Proceedings of the Fourth International Conference on Configurable Distributed Systems, pages 35--42, 1998.

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C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A dynamic reconfiguration service for CORBA. In Intl. Conf. on Configurable Dist. Systems, pages 35--42, May 1998.

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Bidan, C., Issarny, V., Saridakis, T., Zarras, A.: A Dynamic Reconfiguration Service for CORBA. In: International Conference on Configurable Distributed Systems (ICCDS '98). (1998)

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C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A dynamic reconfiguration service for CORBA. In 4th Intl. Conf. on Configurable Dist. Systems, pages 35--42, Annapolis, MD, May 1998.

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Bidan, C., Issarny, V., Saridakis, T., and Zarras, A., "A Dynamic Reconfiguration Service for CORBA". In Proceedings of the 4th International Conference on Configurable Distributed Systems, Annapolis, Maryland, USA, May 1998.

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Bidan C., Issarny V., Saridakis T. and Zarras A. A Dynamic Reconfiguration Service for CORBA. Proceedings of IEEE International Conference on Configurable Distributed Systems, May 1998.

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C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A dynamic reconfiguration service for CORBA. In 4th International Conference on Configurable Distributed Systems, pages 35--42, Annapolis, MD, May 1998.

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C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A dynamic reconfiguration service for CORBA. International Conference on Configurable Distributed Systems, pages 35--42. IEEE Computer Society Press, 1998.

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C. Bidan, V. Issarny, T. Saridakis, A. Zarras. A dynamic reconfiguration service for CORBA, in Proc. IEEE International Conference on Configurable Distributed Systems, May 1998.

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Bidan, C., Issarny, V., Saridakis, T., and Zarras, A., "A Dynamic Reconfiguration Service for CORBA". In Proceedings of the 4th International Conference on Configurable Distributed Systems, Annapolis, Maryland, USA, May 1998.

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Bidan, C., Issarny, V., Saridakis, T., and Zarras, A., "A Dynamic Reconfiguration Service for CORBA". In Proceedings of the 4th International Conference on Configurable Distributed Systems, Annapolis, Maryland, USA, May 1998.

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C. Bidan, V. Issarny, T. Saridakis, and A. Zarras. A dynamic reconfiguration service for CORBA. In 4th Intl. Conf. on Configurable Dist. Systems, 1998.

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