Method and system for management of resource leases in an application framework system

• US 20020078213A1
• Filed: 12/15/2000
• Published: 06/20/2002
• Est. Priority Date: 12/15/2000
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Chang, Ching-Jye, Ullman, Lorin Evan
• Granted Patent: US 6,950,874 B2
• Time in Patent Office: Days
• US Class Current: 709/229
• CPC Class Codes: G06F 9/465 Distributed object oriented systems remote method invocation [RMI] G06F9/548
• CPC Class Codes: G06F 9/5061 Partitioning or combining of resources

Abstract

A method, system, apparatus, and computer program product are presented for management of resource leases within a distributed data processing system. A resource manager receives a lease request from a requester for a resource in which the lease request has a requested lease period. In response to receiving the lease request, the resource manager secures leases along a logical circuit of resources through the distributed data processing system. The resource manager requests leases from other resource managers along the data path that comprises the logical circuit because use of the requested resource requires use of other resources. After securing leases on a logical circuit of resources, the resource manager returns a lease grant for the resource to the requester. If the system detects oversubscribed conditions and/or error conditions, the system can adjust the pending leases in an appropriate manner, such as terminating a lease, adjusting the lease period of a lease, and the like.

Claims

1. A method for managing resources within a distributed data processing system, the method comprising the steps of:

receiving a lease request for a resource;

in response to receiving the lease request, securing leases on a logical circuit of resources through the distributed data processing system; and

in response to securing leases on a logical circuit of resources, sending a lease grant for the resource.

2. The method of claim 1, wherein the step of receiving a lease request for a resource further comprises:

receiving, at a first resource manager, a request from a resource requester to lease a first requested resource for a requested lease period.

3. The method of claim 2, wherein the step of securing a logical circuit of resources further comprises:

determining a data path through the distributed data processing system between the resource requester and the requested resource;

requesting, by the first resource manager, a lease from a second resource manager for a second requested resource along the data path, wherein use of the first requested resource requires use of the second requested resource; and

receiving, at the first resource manager, a first granted lease for the second requested resource from the second resource manager.

4. The method of claim 3, wherein the step of sending a lease grant for the resource further comprises:

in response to receiving the first granted lease for the second requested resource, sending a second granted lease to the resource requester by the first resource manager.

5. The method of claim 4 further comprising:

detecting an oversubscribed condition on the first requested resource; and

in response to the detected oversubscribed condition, reducing a requested lease period in the second granted lease.

6. The method of claim 3, wherein the step of determining a data path through the distributed data processing system further comprises:

retrieving a predetermined data path that has been previously stored after a dynamic discovery process of devices within the distributed data processing system.

7. The method of claim 1 further comprising:

detecting an oversubscribed condition on the resource; and

reducing a lease period for the granted lease.

8. The method of claim 1 further comprising:

detecting an error condition; and

reducing a lease period for the lease grant.

9. An apparatus for managing resources within a distributed data processing system, the apparatus comprising:

first receiving means for receiving a lease request for a resource;

securing means for securing, in response to receiving the lease request, leases on a logical circuit of resources through the distributed data processing system; and

sending means for sending, in response to securing leases on a logical circuit of resources, a lease grant for the resource.

10. The apparatus of claim 9, wherein the first receiving means further comprises:

second receiving means for receiving, at a first resource manager, a request from a resource requester to lease a first requested resource for a requested lease period.

11. The apparatus of claim 10, wherein the securing means further comprises:

determining means for determining a data path through the distributed data processing system between the resource requester and the requested resource;

requesting means for requesting, by the first resource manager, a lease from a second resource manager for a second requested resource along the data path, wherein use of the first requested resource requires use of the second requested resource; and

third receiving means for receiving, at the first resource manager, a first granted lease for the second requested resource from the second resource manager.

12. The apparatus of claim 11, wherein the first sending means further comprises:

second sending means for sending, in response to receiving the first granted lease for the second requested resource, a second granted lease to the resource requester by the first resource manager.

13. The apparatus of claim 12 further comprising:

first detecting means for detecting an oversubscribed condition on the first requested resource; and

first reducing means for reducing in response to the detected oversubscribed condition, a requested lease period in the second granted lease.

14. The apparatus of claim 11, wherein the determining means further comprises:

retrieving means for retrieving a predetermined data path that has been previously stored after a dynamic discovery process of devices within the distributed data processing system.

15. The apparatus of claim 9 further comprising:

second detecting means for detecting an oversubscribed condition on the resource; and

second reducing means for reducing a lease period for the granted lease.

16. The apparatus of claim 9 further comprising:

third detecting means for detecting an error condition; and

third reducing means for reducing a lease period for the lease grant.

18. The computer program product of claim 17, wherein the first instructions for receiving further comprises:

second instructions for receiving, at a first resource manager, a request from a resource requester to lease a first requested resource for a requested lease period.

19. The computer program product of claim 18, wherein the instructions for securing further comprises:

instructions for determining a data path through the distributed data processing system between the resource requester and the requested resource;

instructions for requesting, by the first resource manager, a lease from a second resource manager for a second requested resource along the data path, wherein use of the first requested resource requires use of the second requested resource; and

third instructions for receiving, at the first resource manager, a first granted lease for the second requested resource from the second resource manager.

20. The computer program product of claim 19, wherein the first instructions for sending further comprises:

second instructions for sending, in response to receiving the first granted lease for the second requested resource, a second granted lease to the resource requester by the first resource manager.

21. The computer program product of claim 20 further comprising:

first instructions for detecting an oversubscribed condition on the first requested resource; and

first instructions for reducing in response to the detected oversubscribed condition, a requested lease period in the second granted lease.

22. The computer program product of claim 19, wherein the instructions for determining further comprises:

instructions for retrieving a predetermined data path that has been previously stored after a dynamic discovery process of devices within the distributed data processing system.

23. The computer program product of claim 17 further comprising:

second instructions for detecting an oversubscribed condition on the resource; and

second instructions for reducing a lease period for the granted lease.

24. The computer program product of claim 17 further comprising:

third instructions for detecting an error condition; and

third instructions for reducing a lease period for the lease grant.

26. The network of claim 25, wherein the first receiving means further comprises:

second receiving means for receiving, at a first resource manager, a request from a resource requester to lease a first requested resource for a requested lease period.

27. The network of claim 26, wherein the securing means further comprises:

determining means for determining a data path through the distributed data processing system between the resource requester and the requested resource;

requesting means for requesting, by the first resource manager, a lease from a second resource manager for a second requested resource along the data path, wherein use of the first requested resource requires use of the second requested resource; and

third receiving means for receiving, at the first resource manager, a first granted lease for the second requested resource from the second resource manager.

28. The network of claim 27, wherein the first sending means further comprises:

second sending means for sending, in response to receiving the first granted lease for the second requested resource, a second granted lease to the resource requester by the first resource manager.

29. The network of claim 28 further comprising:

first detecting means for detecting an oversubscribed condition on the first requested resource; and

first reducing means for reducing in response to the detected oversubscribed condition, a requested lease period in the second granted lease.

30. The network of claim 27, wherein the determining means further comprises:

retrieving means for retrieving a predetermined data path that has been previously stored after a dynamic discovery process of devices within the distributed data processing system.

31. The network of claim 25 further comprising:

second detecting means for detecting an oversubscribed condition on the resource; and

second reducing means for reducing a lease period for the granted lease.

32. The network of claim 25 further comprising:

third detecting means for detecting an error condition; and

third reducing means for reducing a lease period for the lease grant.

17. A computer program product on a computer readable medium for use in a data processing system for managing resources within the distributed data processing system, the computer program product comprising:

first instructions for receiving a lease request for a resource;

instructions for securing, in response to receiving the lease request, leases on a logical circuit of resources through the distributed data processing system; and

first instructions for sending, in response to securing leases on a logical circuit of resources, a lease grant for the resource.

25. A network comprising:

first receiving means for receiving a lease request for a resource;

securing means for securing, in response to receiving the lease request, leases on a logical circuit of resources through the distributed data processing system; and

sending means for sending, in response to securing leases on a logical circuit of resources, a lease grant for the resource.