Takizawa, M., and Yasuzawa, S., "Uncompensatable Deadlock in Distributed ObjectOriented Systems," Proc. of Int'l Conf . on Parallel and Distributed Systems (IC- PADS'92 ), 1992, pp.150--157.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....by the object with respect to QoS. That is, QoSbased equivalency and compatibility of operations are defined. we discuss how the system supports the applications with QoS required in the change of QoS supported by the objects. In this paper, we discuss a way to compute the compensating operations [9, 13] of the operations computed after c i in order to roll o i back to c i . In addition, it is critical for o i to support QoS required by the application when o i is rolled back. In multimedia applications, it takes time to re store a large volume of high resolution video data. Instead of restoring ....

....total amount of A and B, s 2 is considered to be equivalent with s 1 . Thus, two states s and s 0 of o are equivalent (s j s 0 ) iff the application considers that s 0 is the same as s. op j is a semantically compensating operation of op i if op i ffi op j (s i ) j s for every state s of o [13]. Here, it is noted that op i ffi op j (s) may not be s. op i denotes a semantically compensating operation of op i . For example, an operation t 1 transfers money a 1 from an account A to B. t 2 transfers money b 1 from B to A. For every state s, t 1 ffi t 2 (s) s if a 1 = b 1 . Here, t 2 is a ....

Takizawa, M., and Yasuzawa, S., "Uncompensatable Deadlock in Distributed ObjectOriented Systems," Proc. of Int'l Conf . on Parallel and Distributed Systems (IC- PADS'92 ), 1992, pp.150--157.

....lower quality image if display can output only lower quality image. QoS viewed through display is view QoS of the object. Effects done by methods computed have to be removed if applications requirements are not satisfied, e.g. the system is faulty. The effects can be removed by the compensation [7,12] of the methods computed. In multimedia applications, it takes time to restore a large volume of high resolution video data. We can reduce time for recovering the system if data with lower resolution but satisfying the application requirement is restored instead of restoring the high resolution ....

Takizawa, M. and Yasuzawa, S., "Uncompensatable Deadlock in Distributed Object-Oriented Systems," Proc. of IEEE ICPADS-92 , 1992, pp.150--157.

....enough QoS. o i supports service through the operations which manipulate the state of o i . In this paper, we discuss how the system supports the applications with QoS required in the change of QoS supported by the objects. In this paper, we discuss a way to compute the compensating operations [9, 13] of the operations computed after c i in order to roll o i back to c i . In addition, it is critical for o i to support QoS required by the application when o i is rolled back. In multimedia applications, it takes time to restore a large volume of high resolution video data. Instead of restoring ....

Takizawa, M., and Yasuzawa, S., "Uncompensatable Deadlock in Distributed Object-Oriented Systems," Proc. of Int'l Conf . on Parallel and Distributed Systems (ICPADS'92 ), 1992, pp.150--157.

....satisfy applications requirements. For example, if an object is faulty, while multiple objects are cooperating by exchanging messages, the object has to be rolled back. Various kinds of checkpoint and rollback algorithms are discussed so far. The effects can also be removed by the compensation [9, 13] of the methods performed. In multimedia applications, it takes time to restore a large volume of high resolution video data. We can reduce time for recovering the system if data with lower resolution but satisfying the applications requirements is restored instead of restoring the highresolution ....

Takizawa, M. and Yasuzawa, S., "Uncompensatable Deadlock in Distributed Object-Oriented Systems," Proc. of IEEE ICPADS-92 , 1992, pp.150--157.

....commit, v commits. Unless v can pass o j , i.e. v cannot lock ho j i, v j aborts. In the conventional database systems, a transaction aborts, i.e. whole update effect done by the transaction is removed. On the other hand, only the part of the transaction can be aborted, i.e. partial abortion [12, 17, 18]. That is, another path may be tried to be found from o j01 if v aborts. By backing to some o k (k j) another path for o k may be tried to be 7 found. o tries to find alternate paths for o j01 It can not be seen from the higher level of o, i.e. the movement on o is atomic. Thus, the vehicle ....

Yasuzawa, S. and Takizawa, M., "Uncompensatable Deadlock in Distributed ObjectOriented Systems," Proc. of the International Conference on Parallel and Distributed Systems (ICPADS ), 1992, pp.150-157. 12

....and compatibility among the operations in terms of views obtained by applying the operations to the objects. In order to manipulate and manage the objects, effects done by operations have to be removed. While checkpoints are usually used, the effects can be removed by the compensating operations [11, 15] of the operations computed. In multimedia applications, it takes time to restore a large volume of high resolution video data. We can reduce time for recovering the system if data with lower resolution but satisfying the application requirement is restored instead of restoring the high resolution ....

Takizawa, M. and Yasuzawa, S., "Uncompensatable Deadlock in Distributed Object-Oriented Systems," Proc. of IEEE Int'l Conf . on Parallel and Distributed Systems (ICPADS-92 ), 1992, pp.150--157.

....only lower quality image. QoS viewed by display is view QoS of the object M . E#ects done by methods computed have to be removed if applications requirements are not satisfied, e.g. the system is faulty. While checkpoints are usually used to do so, the e#ects can be removed by the compensation [12, 19] of the methods computed. In multimedia applications, it takes time to restore a large volume of high resolution video data. We can reduce time for recovering the system if data with lower resolution but satisfying the application requirement is restored instead of restoring the high resolution ....

Takizawa, M. and Yasuzawa, S., "Uncompensatable Deadlock in Distributed Object-Oriented Systems, " Proc. of IEEE ICPADS-92 , : 150--157, 1992.

....operations with respect to QoS. That is, QoS based equivalency and compatibility of operations are defi ned. We discuss how the system supports the applications with QoS required in the change of QoS supported by the objects. In this paper, we discuss a way to compute the compensating operations [9, 13] of the operations computed after the checkpointc i in order to roll o i back to c i . In addition, it is critical for o i to supportQoS required by the application when o i is rolled back. In multimedia applications, it takes time to restore a large volume of high resolutionvideo data. Instead of ....

Takizawa, M., and Yasuzawa, S., " Uncompensatable Deadlock in Distributed Object-Oriented Systems," Proc. of IEEE Int'l Conf . on Parallel and Distributed Systems (ICPADS'92), 1992, pp.150-- 157.

....the ancestors of o j , v j is referred to as abort. In the conventional database systems, if a transaction aborts, the transaction disappeared after the whole update effect done by the transaction is removed. On the other hand, only the part of the transaction can be aborted, i.e. partial abortion [12, 17, 18]. By backing to some o k (k j) passed by v, another path from o k to the destination may be tried to be found. If a new path from o j is found, v takes the path. It can not be seen from the higher level objects of o, i.e. the movement on o is atomic. Suppose that a vehicle v can be separated ....

Yasuzawa, S. and Takizawa, M., "Uncompensatable Deadlock in Distributed Object-Oriented Systems," Proc. of the International Conference on Parallel and Distributed Systems (ICPADS ), 1992, pp.150-157.

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) Takizawa, M. and Yasuzawa, S., "Uncompensatable Deadlock in Distributed ObjectOriented Systems," Proc. of IEEE ICPADS92 , 1992, pp.150--157.

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