Database-Less Leasing

• US 20070271365A1
• Filed: 10/18/2006
• Published: 11/22/2007
• Est. Priority Date: 05/16/2006
• Status: Active Grant

• Current Assignee: Oracle International Corporation (Oracle Corporation)
• Original Assignee: BEA Systems Incorporated (Oracle Corporation)
• Inventors: Revanuru, Naresh, Fung, Priscilla C., Ranganathan, Venkatesan
• Granted Patent: US 8,122,108 B2
• Time in Patent Office: Days
• US Class Current: 709/223
• CPC Class Codes: G06F 16/00 Information retrieval; Database structures therefor; File system structures therefor
• CPC Class Codes: H04L 67/10 in which an application is distributed across nodes in the network software deployment G06F8/60; multiprogramming arrangements G06F9/46
• CPC Class Codes: H04L 67/62 Establishing a time schedule for servicing the requests
• CPC Class Codes: H04L 69/28 Timers or timing mechanisms used in protocols

Abstract

One embodiment of the present invention comprises determining a cluster leader and using the cluster leader to set up a lease table at an application server of a cluster of application servers. The lease table can be used to maintain at least one lease for a singleton service.

Claims

1. A computer implemented method comprising:

at a cluster of application servers, determining a cluster leader;

using the cluster leader to set up a lease table at one of the application servers;

using the lease table to maintain at least one lease for a singleton service.

2. The computer implemented method of claims 1, wherein the lease table is used to allow automatic migration of the singleton service.

3. The computer implemented method of claim 1, wherein the cluster leader is selected in a competition.

4. The computer implemented method of claim 1, wherein each application server periodically attempts to be the cluster leader.

5. The computer implemented method of claim 1, wherein the determining step comprises selecting the application server that was started earliest.

6. The computer implemented method of claim 1, wherein the cluster leader heartbeats other application servers of the cluster.

7. The computer readable medium of claims 6, wherein if the cluster leader fails to heartbeat the other application servers, the other application servers select another cluster leader.

8. The computer implemented medium of claim 1, wherein the lease table is set up at the same application server as the cluster leader.

9. A computer implemented method comprising:

a cluster of application servers;

selecting a cluster leader based on the first application server that is running first; and

using the cluster master to set up a lease table at one of the application servers.

10. The computer implemented method of claims 9, wherein the lease table is used to maintain at least one lease for a singleton service.

11. The computer implemented method of claims 9, wherein the lease table is used to allow automatic migration of the singleton service.

12. The computer implemented method of claim 9, wherein the cluster leader is selected in a competition.

13. The computer implemented method of claim 12, wherein each application server periodically attempts to be the cluster leader.

14. The computer implemented method of claim 9, wherein the cluster leader heartbeats other application servers of the cluster.

15. The computer readable medium of claims 14, wherein if the cluster leader fails to heartbeat the other application servers, the other application servers select another cluster leader.

16. The computer implemented medium of claim 9, wherein the lease table is set up at the same application server as the cluster leader.

17. A computer implemented system wherein a lease table is maintained at an application server of a cluster of applications servers, and wherein other application servers of the cluster use the lease table to maintain at least one least one lease for a singleton server.

18. The computer implemented system of claim 17, wherein the lease table is used by a cluster leader.

19. The computer implemented system of claims 18, wherein the cluster leader is selected by polling the application servers in the cluster.

20. The computer implemented system of claim 19, wherein the lease table is placed at the same application server as the cluster leader.