Maintaining client affinity in network load balancing systems

Details Maintaining client affinity in network load balancing systems Maintaining client affinity in network load balancing systems

2008-08-29

2011-10-25

Boutah, Alina N. (Department: 2443)

Electrical computers and digital processing systems: multicomput

Computer network managing

Network resource allocating

C709S229000, C718S105000

Reexamination Certificate

active

08046467

ABSTRACT:
Described is a technology in a network load balancing system (node cluster), by which client affinity is preserved across cluster configuration changes, including for new connections from a previous client. Each node maintains a list of the clients that are to remain (have affinity, or “stickiness”) with that node, including following bucket redistribution resulting from convergence. Each affinity list is communicated during convergence so that other nodes may build an exception list or lists. Via a node's exception list, the node that owns a bucket corresponding to a client knows of the affinity with another node and thus drops any packets from that client. Affinity may expire, whereby the node having affinity with that client releases it and notifies the node owning the bucket for that client that the client is no longer to be treated as an exception.

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