Method, system, and program for system recovery

• US 20050172288A1
• Filed: 01/30/2004
• Published: 08/04/2005
• Est. Priority Date: 01/30/2004
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Zou, Chendong, Mathrubutham, Ramani, Sathye, Adwait, Ahuja, Pratima
• Granted Patent: US 7,650,606 B2
• Time in Patent Office: Days
• US Class Current: 718/101
• CPC Class Codes: G06F 11/1438 Restarting or rejuvenating
• CPC Class Codes: G06Q 10/06316 Sequencing of tasks or work
• CPC Class Codes: G06Q 10/10 Office automation; Time management
• CPC Class Codes: G06Q 20/10 specially adapted for electronic funds transfer [EFT] systems; specially adapted for home banking systems
• CPC Class Codes: G06Q 20/105 involving programming of a portable memory device, e.g. IC cards, "electronic purses"

Abstract

Disclosed is a technique for system recovery. Information identifying one or more work requests is retrieved, along with an order of the work requests, for a business process. If the business process is non-transactional, an in-memory structure is created for the business process, a recovery stub is created for each work request, and the recovery stub for each work request is placed into the in-memory structure based on the order. Also disclosed is a technique for system recovery in which, if the business process is transactional, an in-memory structure is created for the business process, a recovery stub is created for each work request that indicates that rollback is to be performed, and the recovery stub is placed for each work request into the in-memory structure based on the order. Furthermore, an alternative technique for system recovery is disclosed in which, if the business process is transactional, a rollback is performed for each work request, and an in-memory structure is created for the business process. New work requests may be accepted in the in-memory structure after processing each of the one or more identified work requests for both transactional and non-transactional business processes.

Claims

1. A method for system recovery, comprising:

retrieving information identifying one or more work requests, along with an order of the work requests, for a business process; and

if the business process is non-transactional,

creating an in-memory structure for the business process;

creating a recovery stub for each work request; and

placing the recovery stub for each work request into the in-memory structure based on the order.

2. The method of claim 1, further comprising:

accepting new work requests in the in-memory structure after processing each of the one or more identified work requests.

3. The method of claim 1, further comprising:

if the business process is transactional,

creating an in-memory structure for the business process;

creating a recovery stub for each work request, wherein the recovery stub indicates that rollback is to be performed; and

placing the recovery stub for each work request into the in-memory structure based on the order.

4. The method of claim 1, further comprising:

if the business process is transactional,

performing a rollback for each work request; and

creating an in-memory structure for the business process.

5. The method of claim 4, further comprising:

accepting new work requests in the in-memory structure after processing each of the one or more identified work requests.

6. The method of claim 1, wherein the information identifying the one or more work requests is retrieved by querying a log.

7. The method of claim 6, wherein the recovery stub is created using the retrieving information from the log.

8. The method of claim 1, further comprising:

retrieving an item from the in-memory structure;

determining whether the item is a recovery stub; and

if the item is a recovery stub, converting the recovery stub into a complete work request.

9. The method of claim 8, wherein new work requests are being simultaneously received.

10. The method of claim 1, wherein the system is logically recovered to a consistent system state without executing the work requests that failed during system failure.

11. An article of manufacture including a program for system recovery, wherein the program causes operations to be performed, the operations comprising:

retrieving information identifying one or more work requests, along with an order of the work requests, for a business process; and

if the business process is non-transactional,

creating an in-memory structure for the business process;

creating a recovery stub for each work request; and

placing the recovery stub for each work request into the in-memory structure based on the order.

12. The article of manufacture of claim 11, wherein the operations further comprise:

accepting new work requests in the in-memory structure after processing each of the one or more identified work requests.

13. The article of manufacture of claim 11, wherein the operations further comprise:

if the business process is transactional,

creating an in-memory structure for the business process;

creating a recovery stub for each work request, wherein the recovery stub indicates that rollback is to be performed; and

placing the recovery stub for each work request into the in-memory structure based on the order.

14. The article of manufacture of claim 11, wherein the operations further comprise:

if the business process is transactional,

performing a rollback for each work request; and

creating an in-memory structure for the business process.

15. The article of manufacture of claim 14, wherein the operations further comprise:

accepting new work requests in the in-memory structure after processing each of the one or more identified work requests.

16. The article of manufacture of claim 11, wherein the information identifying the one or more work requests is retrieved by querying a log.

17. The article of manufacture of claim 16, wherein the recovery stub is created using the retrieving information from the log.

18. The article of manufacture of claim 11, wherein the operations further comprise:

retrieving an item from the in-memory structure;

determining whether the item is a recovery stub; and

if the item is a recovery stub, converting the recovery stub into a complete work request.

19. The article of manufacture of claim 18, wherein new work requests are being simultaneously received.

20. The article of manufacture of claim 11, wherein the system is logically recovered to a consistent system state without executing the work requests that failed during system failure.

21. A computer system having logic for system recovery, wherein the hardware logic is executed by the computer system, the hardware logic comprising:

retrieving information identifying one or more work requests, along with an order of the work requests, for a business process; and

if the business process is non-transactional,

creating an in-memory structure for the business process;

creating a recovery stub for each work request; and

placing the recovery stub for each work request into the in-memory structure based on the order.

22. The computer system of claim 21, further comprising:

accepting new work requests in the in-memory structure after processing each of the one or more identified work requests.

23. The computer system of claim 21, further comprising:

if the business process is transactional,

creating an in-memory structure for the business process;

creating a recovery stub for each work request, wherein the recovery stub indicates that rollback is to be performed; and

placing the recovery stub for each work request into the in-memory structure based on the order.

24. The computer system of claim 21, further comprising:

if the business process is transactional,

performing a rollback for each work request; and

creating an in-memory structure for the business process.

25. The computer system of claim 24, further comprising:

accepting new work requests in the in-memory structure after processing each of the one or more identified work requests.

26. The computer system of claim 21, wherein the information identifying the one or more work requests is retrieved by querying a log.

27. The computer system of claim 26, wherein the recovery stub is created using the retrieving information from the log.

28. The computer system of claim 21, further comprising:

retrieving an item from the in-memory structure;

determining whether the item is a recovery stub; and

if the item is a recovery stub, converting the recovery stub into a complete work request.

29. The computer system of claim 28, wherein new work requests are being simultaneously received.

30. The computer system of claim 21, wherein the system is logically recovered to a consistent system state without executing the work requests that failed during system failure.