A new Internet-Draft is available from the on-line Internet-Drafts directories.
Title : AFS Callback Extensions (Draft 14)
Author(s) : M. Benjamin
Filename : draft-benjamin-extendedcallbackinfo-02.txt
Pages : 36
Date : 2011-12-12
AFS cache-control strategy is callback (invalidate) based. The
AFS callback design allows a client to know when an object it
has cached is no longer consistent, but the callback
notification message itself provides no specific information
about the triggering event. This is a protocol inefficiency, as
in several scenarios it results in unnecessary round-trips to
file servers to verify file status information, file access
information, or to fetch file data which has not changed. We
propose an extension of the callback mechanism to provide
information about the event(s) triggering a callback, in the
payload of the callback notification message itself. The
proposed mechanism eliminates most or all unnecessary
round-trips imposed by the current callback mechanism, and
simultaneously allows AFS implementations to (efficiently)
provide correct semantics in several scenarios involving
multiple writers (ie, where AFS currently provides incorrect
semantics).
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