METHOD AND SYSTEM FOR PROVIDING END-TO-END CONTENT-BASED LOAD BALANCING

• US 20090271521A1
• Filed: 04/24/2008
• Published: 10/29/2009
• Est. Priority Date: 04/24/2008
• Status: Abandoned Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Brabson, Roy F.
• Application Number:
  US12/108,682
• Publication Number:
  US 20090271521A1
• Time in Patent Office: Days
• US Class Current: 709/228
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/125 by balancing the load, e.g. traffic engineering
• CPC Class Codes: H04L 47/19 at layers above the network layer network arrangements for networked applications for scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04L 47/193 at the transport layer, e.g. TCP related
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1027 Persistence of sessions during load balancing
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• CPC Class Codes: H04L 67/148 Migration or transfer of sessions
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/163 In-band adaptation of TCP data exchange; In-band control procedures

Abstract

Methods and systems for providing end-to-end content-based load balancing are described. A Transmission Control Protocol (TCP) connection is accepted from a client and a request is received from the client. The request is processed, a target stack is selected, and the TCP connection is transferred to the selected target stack such that the client and selected target stack maintain an end-to-end TCP connection. In an exemplary embodiment, the request can be processed in a TCP kernel. In another preferred embodiment, the TCP connection can include TCP data packets and the request can include request data packets. The TCP connection transfer can be performed by replaying the TCP data packets and the request data packets to the selected target stack.

Claims

1. A method for providing end-to-end content-based load balancing comprising:

accepting a Transmission Control Protocol (TCP) connection from a client;

receiving a request from the client;

processing the request;

selecting a target stack; and

transferring the TCP connection to the selected target stack such that the client and selected target stack maintain an end-to-end TCP connection.

2. The method of claim 1 wherein the TCP connection comprises TCP data packets and the request comprises request data packets, wherein the transferring the TCP connection is performed by replaying the TCP data packets and the request data packets to the selected target stack.

3. The method of claim 1 wherein the method is performed using a load balancer.

4. The method of claim 3 wherein the load balancer comprises a TCP state, wherein the transferring the TCP connection is performed by marshalling the TCP state and transferring the TCP state to the selected target stack.

5. The method of claim 1 wherein the request is processed within a TCP kernel.

6. The method of claim 3 wherein the load balancer comprises a user-space, wherein the request is processed within an application residing within the user-space.

7. The method of claim 1 further comprising transferring a TCP sequence number to the selected target stack.

8. The method of claim 3 wherein the load balancer comprises a connection table, further comprising updating the connection table such that future requests made by the client are transferred to the selected target stack.

9. A system for providing end-to-end content-based load balancing comprising:

a load balancer, wherein the load balancer is configured to accept a Transmission Control Protocol (TCP) connection from a client, receive a request from the client, process the request, select a target stack, and transfer the TCP connection to the selected target stack such that the client and the selected target stack maintain an end-to-end TCP connection.

10. The system of claim 9 wherein the TCP connection comprises TCP data packets and the request comprises request data packets, wherein the transferring the TCP connection is performed by replaying the TCP data packets and the request data packets to the selected target stack.

11. The system of claim 9 wherein the load balancer further comprises a TCP state, wherein the transferring the TCP connection is performed by marshalling the TCP state transferring the TCP state to the selected target stack

12. The system of claim 9 wherein the load balancer further comprises a TCP kernel, wherein the request is processed within the TCP kernel.

13. The system of claim 9 wherein the load balancer further comprises a user-space, wherein the request is processed within an application residing within the user-space.

14. The system of claim 9 wherein the load balancer is further configured to transfer a TCP sequence number to the selected target stack.

15. The system of claim 9 wherein the load balancer further comprises a connection table and is further configured to update the connection table such that future requests made by the client are transferred to the selected target stack.

16. An executable software product stored on a computer-readable medium containing program instructions for providing end-to-end content-based load balancing, the program instructions for:

accepting a Transmission Control Protocol (TCP) connection from a client;

receiving a request from the client;

processing the request;

selecting a target stack; and

transferring the TCP connection to the selected target stack such that the client and selected target stack maintain an end-to-end TCP connection.

17. The executable software product of claim 16, wherein the TCP connection comprises TCP data packets and the request comprises request data packets, wherein the transferring the TCP connection is performed by replaying the TCP data packets the request data packets to the selected target stack.

18. The executable software product of claim 16, wherein the program instructions are executed using a load balancer.

19. The executable software product of claim 16, wherein the request is processed within a TCP kernel.

20. The executable software product of claim 18, wherein the load balancer comprises a user-space, wherein the request is processed within an application residing within the user-space.

21. The executable software product of claim 18, wherein the load balancer comprises a TCP state, wherein the transferring the TCP connection is performed by marshalling the TCP state transferring the TCP state to the selected target stack.

22. The executable software product of claim 16, further comprising program instructions for transferring a TCP sequence number to the selected target stack.

23. The executable software product of claim 18, wherein the load balancer comprises a connection table, further comprising updating the connection table such that future requests made by the client are transferred to the selected target stack.