Re: [ws-rx] New Issue; SequenceAcknowledgement:Final assumption ofdeliverability

Bob,

  I'm confused - doesn't the sending
of an Ack for a certain message number already imply that the RMD is taking
responsibility for it?  If only SeqAck+Final means that, then does
that mean that a SeqAck (non-final) means something less?  like a
lie?

-Doug

"Bob Freund-Hitachi"
<> 

03/22/2006 02:07 PM

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Subject

[ws-rx] New Issue; SequenceAcknowledgement:Final
assumption of deliverability

Description

Modify definition of SequenceAcknowledgement:Final to reflect accurate
ending delivery capability status.

Justification

The protocol defines the SequenceAcknowledgement:Final element which contains
the final summary of message acknowledgements at the closure of a sequence.
It is assumed that the RMD has taken responsibility for all messages that
have been acknowledged.  Depending upon the operation of the RMD and
its interface with the application, Messages that have been previously
acknowledged as received by the RMD, may never be deliverable.  One
such case of note that comes to mind is the situation of a message sequence
that is being delivered in-order to an application which is closed at the
time when one or more gaps that may exist in the sequence.  If this
situation occurs, the RMS will have incorrect information concerning exactly
which messages have been or will be deliverable at the conclusion of a
sequence.

Note that there is nothing in the spec
that states what the RMS is to do with the information contained in SequenceAcknowledgement:Final.
 This proposal does not add any such statement, but it does permit
the information to be potentially interpretable.

Target: core

Proposal:

Reference Core Spec CD03

insert after line 613:

SequenceAcknowledgemnt:Final shall identify only those messages that have
been delivered or which the RMD has taken responsibility for delivery without
regard to the previous acknowledgement status of any message.

State Table impact: None