Kevin Reid: remove accidentally included title-in-body

Kevin Reid — Thu, 06 Sep 2007 14:59:08 GMT

remove accidentally included title-in-body

New page

This is [[User:Kevin Reid]]'s idea for implementing transparent load-balancing replication for services exposed over [[Pluribus]].

==Premises==

We have a set of hosts running replicas of the actual service (ignoring their internal communication topology), and (possibly identical) a set of hosts which are exposed to the Internet and provide some mechanism (e.g. round robin DNS) for letting a client connect to an arbitrary one of them.

==Implementation==

Each of the exposed hosts is running a 'pseudo-[[vat]]'; all pseudo-vats have the same [[VatID]]. The clients hold ordinary [[SturdyRef]]s referring to this VatID.

A pseudo-vat implements [[CapTP]] trivially: it ignores all incoming messages except [[nonceLocator#lookupSwiss/2]]. A successful lookup returns a [[live reference]] to a [[presence]] of the relevant object in one of the replica-vats.

In order to preserve transparency, the pseudo-vat must not support any feature (e.g. incoming [[3Desc]]s, [[WormholeOp]], etc.) which would require it to connect to other vats, as then its non-singular nature could be revealed.

==Notes==

The pseudo-vat should be a reasonably simple application of the CapTP-in-E subsystem (if it isn't possible, CapTP-in-E needs to be redesigned).

However, in order to support the [[3-vat introduction]] for the redirected-to live ref, the [[NonceLocator]]s provided by the replica-vats must be able to accept acceptFrom messages specifying the pseudo-vat's [[VatID]]; the normal [[gift table]] mechanism would require that there be a live connection between the pseudo-vat-instance and the replica-vat.

Kevin Reid: new document

Kevin Reid — Thu, 06 Sep 2007 14:54:30 GMT

new document

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	This is [[User:Kevin Reid]]'s idea for implementing transparent load-balancing replication for services exposed over [[Pluribus]].		This is [[User:Kevin Reid]]'s idea for implementing transparent load-balancing replication for services exposed over [[Pluribus]].

SturdyRef replication - Revision history

Kevin Reid: remove accidentally included title-in-body

Kevin Reid: new document