Stream control failover utilizing an attribute-dependent protection mechanism

• US 8,370,649 B2
• Filed: 05/14/2010
• Issued: 02/05/2013
• Est. Priority Date: 03/31/2006
• Status: Active Grant

• Current Assignee: Synamedia Limited
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Sherer, W. Paul, Blattman, Kirk, Connery, Glenn, Chou, Hoi-Tauw, Major, Robert Drew, Oyer, Mel, Davis, Howard, Kiewlich, Daniel, Sharma, Neeraj K.
• Primary Examiner(s): Zand, Kambiz
• Assistant Examiner(s): Hailu, Teshome
• Application Number:
  US12/780,598
• Publication Number:
  US 20100223394A1
• Time in Patent Office: 998 Days
• Field of Search: 713/193
• US Class Current: 713/193
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/612 for unicast
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1008 based on parameters of servers, e.g. available memory or workload monitoring of computer activity G06F11/30
• CPC Class Codes: H04L 67/101 based on network conditions
• CPC Class Codes: H04L 67/1012 based on compliance of requirements or conditions with available server resources
• CPC Class Codes: H04L 67/1034 Reaction to server failures by a load balancer
• CPC Class Codes: H04N 21/2181 comprising remotely distributed storage units, e.g. when movies are replicated over a plurality of video servers distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097
• CPC Class Codes: H04N 21/266 Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
• CPC Class Codes: H04N 21/631 Multimode Transmission, e.g. transmitting basic layers and enhancement layers of the content over different transmission paths or transmitting with different error corrections, different keys or with different transmission protocols
• CPC Class Codes: H04N 21/64322 IP

Abstract

A technique for managing the streaming of digital video content to multiple clients involves identifying an attribute of a content element that is streamed to a client and selecting a protection mechanism for the content element as a function of the attribute, wherein the protection mechanism enables streaming of the content element to the clients in the event of a resource failure. In an example, the identified attribute is an indication of the popularity of the content element (e.g., as measured by the number of active streams), such that the protection mechanism is selected as a function of the popularity of the content element. In an embodiment, protection mechanisms that offer a higher level of protection are selected for the more popular content elements and protection mechanisms that offer a lower level of protection are selected for the less popular content elements.

Claims

1. A method for managing the streaming of digital video content to multiple clients, the method comprising:

identifying an attribute of a content element that is streamed to a client; and

selecting a protection mechanism for the content element as a function of the attribute, wherein the protection mechanism enables streaming of the content element to the client from another stream server in the event of a resource failure;

wherein selecting the protection mechanism comprises;

identifying the resource requirements of multiple protection mechanisms;

establishing a fault recovery requirement for a content element; and

selecting, for the content element, the protection mechanism with the lowest resource requirement that meets the fault recovery requirement for the content element, the lowest resource requirement being a least resource intensive protection mechanism meeting the fault recovery requirement, wherein the resource requirement that meets the fault recovery requirement is proportional to a desired speed of recovery in the event of the resource failure, the desired speed of recovery for the content element being a function of the attribute.

2. The method of claim 1 wherein the attribute of the content element is an indication of the popularity of the content element.

3. The method of claim 2 wherein the selection of a protection mechanism further comprises selecting a protection mechanism that provides a higher level of protection for a more popular content element and a lower level of protection for a less popular content element.

4. The method of claim 1 wherein the attribute of the content element is an indication of the type of the content element.

5. The method of claim 4 wherein the attribute of the content element is an indication of the importance of the content element.

6. The method of claim 5 wherein the selection of a protection mechanism further comprises selecting a protection mechanism that provides a higher level of protection for a more important content element and a lower level of protection for a less important content element.

7. The method of claim 1 wherein a selected protection mechanism comprises:

providing the same digital video content to first and second stream servers in a logical group of stream servers;

storing the digital video content into random access memory (RAM) at both the first and second stream servers;

streaming the digital video content to a client from the first stream server but not the second stream server; and

switching to streaming the digital video content to the client from the second stream server instead of the first stream server after a failure is detected in the first stream server, the steaming including activating an interface of the second stream server that was not activated until after the failure in the first stream server was detected.

8. The method of claim 1, further comprising:

evaluating the attribute of the content element based on at least one of;

a periodic basis and a trigger;

determining if the protection mechanism matches the evaluated attribute; and

selecting, if the protection mechanism does not match with the evaluated attribute, a protection mechanism that matches with the evaluated stream.

9. A method for managing the streaming of digital video content to multiple clients, the method comprising:

identifying an attribute of a content element that is streamed to a client; and

selecting a protection mechanism for the content element as a function of the attribute, wherein the protection mechanism enables streaming of the content element to the client in the event of a resource failure;

wherein selecting the protection mechanism comprises;

identifying the resource requirements of multiple different available protection mechanisms;

establishing a fault recovery requirement for a content element, wherein the fault recovery requirement indicates at least one of a maximum acceptable delay for the content element and a maximum acceptable frame loss for the content element; and

selecting, for the content element, the protection mechanism with the lowest resource requirement that still meets the fault recovery requirement for the content element so that the level of protection provided by the selected protection mechanism is matched to the particular fault recovery needs of the content element, the lowest resource requirement being a least resource intensive protection mechanism meeting the fault recovery requirement, wherein the resource requirement that meets the fault recovery requirement is proportional to a desired speed of recovery in the event of the resource failure, the desired speed of recovery for the content element being a function of the attribute.

10. The method of claim 9 wherein the attribute of the content element is an indication of the popularity of the content element.

11. The method of claim 10 wherein the selection of a protection mechanism further comprises selecting a protection mechanism that provides a higher level of protection for a more popular content element and a lower level of protection for a less popular content element.

12. The method of claim 9 wherein the attribute of the content element is an indication of the type of the content element.

13. The method of claim 12 wherein the attribute of the content element is an indication of the importance of the content element.

14. The method of claim 13 wherein the selection of a protection mechanism further comprises selecting a protection mechanism that provides a higher level of protection for a more important content element and a lower level of protection for a less important content element.

15. The method of claim 9 wherein a selected protection mechanism comprises:

providing the same digital video content to first and second stream servers in a logical group of stream servers;

storing the digital video content into random access memory (RAM) at both the first and second stream servers;

streaming the digital video content to a client from the first stream server but not the second stream server; and

switching to streaming the digital video content to the client from the second stream server instead of the first stream server after a failure is detected in the first stream server, the steaming including activating an interface of the second stream server that was not activated until after the failure in the first stream server was detected.

16. A system for managing the streaming of digital video content to multiple clients, the system comprising:

a vault server for storing the digital video content;

a logical group of stream servers configured to ingest the digital video content from the vault server and control the streaming of the digital video content to the multiple clients, wherein the logical group of stream servers is further configured to;

identify an attribute of a content element that is streamed to the clients; and

select a protection mechanism for the content element as a function of the attribute, wherein the protection mechanism enables streaming of the content element to the clients from another stream server in the event of a resource failure;

wherein selecting the protection mechanism comprises;

identifying the resource requirements of multiple protection mechanisms;

establishing a fault recovery requirement for a content element; and

selecting, for the content element, the protection mechanism with the lowest resource requirement that meets the fault recovery requirement for the content element, the lowest resource requirement being a least resource intensive protection mechanism meeting the fault recovery requirement, wherein the resource requirement that meets the fault recovery requirement is proportional to a desired speed of recovery in the event of the resource failure, the desired speed of recovery for the content element being a function of the attribute.

17. The system of claim 16, wherein the logical group of stream servers is further configured to:

generate state information of the streaming of the digital video content;

share the generated state information among the stream servers in the logical group of the stream servers; and

respond to resource failures within the logical group using the shared state information.

18. The system of claim 17, wherein the logical group of stream servers is configured to share the generated state information using a unicast flooding protocol.

19. The system of claim 16, wherein the logical group of stream servers is further configured to:

establish a resiliency group, the resiliency group being a subset of the logical group;

generate state information of the streaming of the digital video content;

share the generated state information among the stream servers in the resiliency group; and

respond to resource failures within the resiliency group using the shared state information.

20. The system of claim 16, wherein each server in the logical group of stream servers is configured to communicate with other stream servers in the logical group using a broadcast IP messaging protocol.