Gordon Sim created PROTON-734:
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Summary: deliveries are not returned in order
Key: PROTON-734
URL: https://issues.apache.org/jira/browse/PROTON-734
Project: Qpid Proton
Issue Type: Bug
Components: proton-c
Affects Versions: 0.8
Reporter: Gordon Sim
Assignee: Rafael H. Schloming
Priority: Critical
If, on a single session, I send e.g. 3 messages on one link, followed by a
message on another link, then on the receiving side I expect those to be
returned in the order in which they are sent.
Although proton-c on the receiving side receives them in the correct order as
verified by turning on tracing, the order in which the respective deliveries
are returned by pn_work_head()/pn_work_next() is not correct. I get the first
message, followed by the last message (i.e. the fourth), then the second and
third.
If I modify the test to send a fifth message to a third link, then on the
receiving side the 5th message is received 3rd. I.e. it appears that the work
queue involves taking the first delivery off each link, rather than having a
session level ordering(?)
In the case where a transaction discharge message is sent *after* some
transactional publications, this results in the discharge being processed
before all the publications the transaction is supposed to cover. (The sender
can of course wait for all the transactional publications to be accepted before
it sends the commit, but on a single session this isn't necessary and as far as
I can see not required by the spec.) In any case, preserving order is likely to
be important in other cases.
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