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Subject: Re: Review of 0.95


Thank you for your comment and question.

The Document Exchange layer in the CPA is the representation of the TRP
layer  (Message Service layer is the correct term).  So the Doc Exchange
layer in the CPA tells the Message Service whether to perform the
idempotency test.

Regarding the idempotency question, my first reaction is to resolve the
confusion by deleting the word "discard" from line 1364. The main reason
for passing the duplicate message to the application is to aid recovery
scenarios in which the application might not have seen the duplicate
message.  However it may be that TRP Reliable Messaging eliminates that
scenario, in which case line 1364 is correct and the paragraph beginning on
line 1376 and the Note following it should be deleted.  The team will
discuss this in Vienna.

Martin Sachs


Martin W. Sachs
IBM T. J. Watson Research Center
P. O. B. 704
Yorktown Hts, NY 10598
914-784-7287;  IBM tie line 863-7287
Notes address:  Martin W Sachs/Watson/IBM
Internet address:  mwsachs @ us.ibm.com

michael.m.ho@sybase.com on 05/04/2001 03:28:55 PM

To:   Martin W Sachs/Watson/IBM@IBMUS
Subject:  Review of 0.95

Page 38.

There seems to be a confusion whether duplicated message should
be forwarded to application with "duplicate" indication (1376) or
discarded (1364) when idempotency test is true.

In fact, the TRP layer is doing the idempotency test. The Doc exchange
layer does not perform this test. Is this the correct assumption?

Sybase eBD

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