A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : AFS Callback Extensions draft-benjamin-extendedcallbackinfo-00
Author(s) : M. Benjamin
Filename : draft-benjamin-extendedcallbackinfo-00.txt
Pages : 1
Date : 2009-09-23
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).Editorial Note
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