DYNAMICALLY ALTERING TIME TO LIVE VALUES IN A DATA CACHE

• US 20130073809A1
• Filed: 09/19/2011
• Published: 03/21/2013
• Est. Priority Date: 09/19/2011
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: ANTANI, SNEHAL S., BHOGAL, KULVIR S., GAUR, NITIN, JOHNSON, CHRISTOPHER D., KAPLINGER, TODD E.
• Granted Patent: US 8,918,602 B2
• Time in Patent Office: Days
• US Class Current: 711/136
• CPC Class Codes: G06F 12/121 using replacement algorithms
• CPC Class Codes: G06F 12/123 with age lists, e.g. queue, most recently used [MRU] list or least recently used [LRU] list
• CPC Class Codes: G06F 2212/465 Structured object, e.g. database record

Abstract

A TTL value for a data object stored in-memory in a data grid is dynamically adjusted. A stale data tolerance policy is set. Low toleration for staleness would mean that eviction is certain, no matter the cost, and high toleration would mean that the TTL value would be set based on total cost. Metrics to report a cost to re-create and re-store the data object are calculated, and the TTL value is adjusted based on calculated metrics. Further factors, such as, cleanup time to evict data from a storage site, may be considered in the total cost.

Claims

1. A method for dynamically adjusting a TTL value for a data object stored in-memory in a data grid, comprising:

setting a stale data tolerance policy;

calculating metrics with a processor to report a cost to re-create and re-store the data object; and

adjusting the TTL value based on said metrics.

2. The method of claim 1, wherein said adjusting the TTL value further comprises using administrative input.

3. The method of claim 2, wherein said adjusting the TTL value further comprises including a stale data policy.

4. The method of claim 3, further comprising provisioning additional in-memory storage in order to handle potential data expansion resulting from storing the data for longer periods of time before eviction when a cost of recreation, thereof, is above a policy value.

5. The method of claim 3, further comprising provisioning less in-memory storage in order to benefit from potential data contraction resulting from storing the data for shorter periods of time before eviction when a cost of recreation, thereof, is below a policy value.

6. The method of claim 1, wherein calculating metrics comprises using aspect-oriented programming instrumentation examining metrics.

7. A computer system for dynamically adjusting a TTL value for a data object stored in-memory in a data grid, comprising:

a processor; and

memory connected to the processor, wherein the memory is encoded with instructions and wherein the instructions when executed comprise;

instructions for setting a stale data tolerance policy;

instructions for calculating metrics to report a cost to re-create and re-store the data object; and

instructions for adjusting the TTL value based on said metrics.

8. The system of claim 7, wherein said instructions for adjusting the TTL value further comprises instructions for using administrative input.

9. The system of claim 8, wherein said instructions for adjusting the TTL value further comprises instructions for including a stale data policy.

10. The system of claim 9, further comprising instructions for provisioning additional in-memory storage in order to handle data expansion resulting from storing the data in-memory for longer periods of time before eviction, thereof, when a cost of recreation thereof is above a policy value.

11. The system of claim 9, further comprising instructions for provisioning less in-memory storage in order to benefit from data contraction resulting from storing the data in-memory for shorter periods of time before eviction, thereof, when a cost of recreation thereof is below a policy value.

12. The system of claim 7, wherein said instructions for calculating metrics comprises instructions for using aspect-oriented programming instrumentation examining metrics.

13. A computer program product for dynamically adjusting a TTL value for a data object stored in-memory in a data grid, the computer program product comprising a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising:

computer readable program code configured to set a stale data tolerance policy;

computer readable program code configured to calculate metrics to report a cost to re-create and re-store the data object; and

computer readable program code configured to adjust the TTL value based on said metrics.

14. The computer program product of claim 13, wherein computer readable program code configured to adjust the TTL value further comprises computer readable program code configured to use administrative input.

15. The computer program product of claim 14, wherein computer readable program code configured to adjust the TTL value further comprises computer readable program code configured to include a stale data policy.

16. The system of claim 15, further comprising computer readable program code configured to provision additional in-memory storage in order to handle potential data expansion resulting from storing the data in-memory for longer periods of time before eviction thereof, when a cost of recreation, thereof, is above a policy value.

17. The system of claim 15, further comprising computer readable program code configured to provision less in-memory storage in order to benefit from potential data contraction resulting from storing the data in-memory for shorter periods of time before eviction thereof, when a cost of recreation, thereof, is below a policy value.

18. The system of claim 13, wherein said computer readable program code configured to calculate metrics comprises computer readable program code configured to use aspect-oriented programming instrumentation examining metrics.