Interceptor

[donaldjeo]

Interceptors are a useful technique for extending the basic functionality provided by an Object Request Broker without changing its implementation, nor affecting clients' code. The recently proposed CORBA standard includes a new defnition of portable interceptors. This defnition is very powerful, yet not trivial to use. In this paper we review this defnition, and discuss how it can be applied to provide client side enhancement for caching, load-balancing, flow control (quality of service), and fault-tolerant soft real-time. A recommendation to the OMG for a very minor change in the standard that could greatly simplify its usability is also provided.

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[bryon.barkley]

KAA,

Thanks for responding, my key concern is that it does not act like a serial cluster but that it does actually load balance connections. Right now we virtually drown the first SH in a serial cluster and that is why we are going to the 9200. I know that you can manually set up load balancing by using redirection rules, but I wasn't sure about the automated process. Thanks again,

Bryon

[KAA]

Hi Bryon,

Initially (and by default), the Interceptor will distribute connections to Steelheads based on a least-connections algorithm. As the Interceptor distributes connections using this algorithm, it builds a peer affinity table. This table keeps track of which remote Steelheads have been redirected to which local Steelheads in the cluster. The Interceptor then uses this table to make all future redirection decisions, ensuring remote Steelheads are always redirected to the same local Steelheads. Peer Affinity serves two purposes:

(1) Maximized probability that a clustered Steelhead will be able to return a reference to the remote client-side Steelhead (ensuring local delivery of data by the client-side Steelhead), and

(2) Reduced duplication of data across clustered Steelhead segstores (data used by a remote site is confined to a single Steelhead in the Interceptor cluster).

These benefits are key differentiators when comparing connection distribution algorithms on the Interceptor to those provided by application delivery switches or redirection protocols like WCCP.

Kaveh Alizadeh
Product Manager
Networking & Security
Riverbed Technology

[bryon.barkley]

Can you please describe the different load balancing methods the Interceptor can perform? I know that you can manually set redirection rules, but is there a way to automatically load balance? Thanks