Short-cut response for distributed services

• US 7,627,650 B2
• Filed: 01/20/2003
• Issued: 12/01/2009
• Est. Priority Date: 01/20/2003
• Status: Active Grant

• Current Assignee: Dell Products LP (Dell Technologies Inc.)
• Original Assignee: Equallogic Incorporated (Dell Technologies Inc.)
• Inventors: Suman, Daniel E., Long, Paula, Hayden, Peter C., Koning, G. Paul, Gillum, Kirtley C.
• Primary Examiner(s): JEAN GILLES, JUDE
• Application Number:
  US10/347,901
• Publication Number:
  US 20040143648A1
• Time in Patent Office: 2,507 Days
• Field of Search: 709/203, 709/225, 709/217, 709/219, 709/192, 709226-228, 709/238, 709/223, 709/224, 710/18, 710/19, 718/104, 718/105, 370/352, 370/401, 713/201, 707/10
• US Class Current: 709/219
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1012 based on compliance of requirements or conditions with available server resources
• CPC Class Codes: H04L 67/1027 Persistence of sessions during load balancing
• CPC Class Codes: H04L 67/1036 Load balancing of requests to servers for services different from user content provisioning, e.g. load balancing across domain name servers
• CPC Class Codes: H04L 67/1038 Load balancing arrangements to avoid a single path through a load balancer
• CPC Class Codes: H04L 67/1095 Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
• CPC Class Codes: H04L 67/51 Discovery or management thereof, e.g. service location protocol [SLP] or web services
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

The systems and methods described herein include methods for providing resources over a data network. The methods may be embodied as processes operating on a computer server, wherein that server comprises a plurality of server platforms, each of which are truly equivalent in that each provides a functionally equivalent interface to a client. In one practice of the invention, a method responds to client requests by detecting a request from a client for access to a resource and by establishing a connection for communicating with the client. The method then identifies a server available for servicing the detected request, and determines whether state information is associated with the connection. The method then, grants the identified server with access to the state information and allows the identified server to create and transmit a response to the client, also allowing the identified server to update the state information.

Claims

1. A method for providing distributed services over a data network, comprising:

detecting at a first server a request from a client for access to a resource and establishing a connection for communicating between the first sever and the client, said connection having state information,

identifying at the first server, which of a plurality of servers, including the first server and a second server, to respond to the detected request;

in an event that the second server is identifying as being responsible for the resource requested, communicating to the second server the state information, and allowing the second server to create and transmit a response directly to the client without having the first server forwarding the response and without establishing a separate connection for communicating with the client, instead sharing with the first server the same connection between the first server and the client, while maintaining at the first server the connection between the first server and the client,

updating the state information at the second server, and

transmitting the updated state information from the second server to the first server.

2. The method of claim 1, further comprising storing the state information in memory.

3. The method of claim 1, wherein the communication connection follows a communication protocol selected from the group consisting of FTP, iSCSI, NFS, CIFS.

4. The method of claim 1, wherein the state information includes information selected from the group consisting if IP addresses, TCP sequence numbers, and iSCSI sequence numbers.

11. The method of claim 1, wherein the second server is identified by the first server.

5. A system for providing distributed services over a data network, comprising:

a first server connecting to the data network and detecting a request from a client for access to a resource, the first server establishing a communication connection with the client, the connection having state information, the first server identifying which one or more servers of a plurality of servers, including the first server is responsible for the resource requested;

A second server associated with the requested resource, and

a socket server for following distributed access to state information associated with the communication connection to allow the second server to create and transmit a response directly to the client without having the first server forwarding the response and without establishing a separate communication connection with the client, instead sharing with the first server the same connection between the first server and the client, while maintaining at the first server the communication connection between the first server and the client, and allow transmission of updated state information from the second server tot the first server.

6. The system of claim 5, wherein the first server includes a listening thread for detecting requests from a client.

7. The system of claim of 6, wherein the listening thread detects request from a client for access to distributed service.

8. The system of claim 5, wherein the communication connection follows a communication protocol selected from the group consisting of FTP, iSCSI, NFS, CIFS.

9. The system of claim of 5, wherein the state information includes information selected from the group consisting of IP addresses, TCP sequence numbers, and iSCSI sequence number.

10. A computer readable medium having stored thereon programming instructions to enable a computer when executing the programming instructions to:

detect at a first server from a client for access to resource and establish a connection for communication between the first server and the client, said connection having state information,

identify at the first server, which of a plurality of servers, including the first sever and a second server, to respond to the detected request;

in an event that the second server is identified as being responsible for the resource requested, communicate to the second server the state information and allow the second server to create and transmit a response directly to the client without having the first server forwarding the response and without establishing a separate connection for communicating with the client, instead sharing with the first server the same connection between the first server and the client, while maintaining at the first server the connection between the first server and the client,

update the state information at the second server, and

transmit the updated state information from second server to the first server updated the state information.