Consumer with byte credit can get ignored if a large message "eclipses" a small
one.
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Key: QPID-1909
URL: https://issues.apache.org/jira/browse/QPID-1909
Project: Qpid
Issue Type: Bug
Components: C++ Broker
Affects Versions: 0.5
Reporter: Alan Conway
Assignee: Alan Conway
Given: A consumer with byte credit N for a queue with messages Big size > N
and Small size < N
The consumer should not be able to consume Big. Now remove Big with a different
consumer.
The consumer should now be able to consume Small, but doesn't
The problem in Qpid.cpp is twofold:
- if a consumer returns "false" from accept, it is assumed to be blocked and
is removed from the listener set. It won't be notified of new messages
- the queue only notifies when new messages arrive. It does not notify when a
blocking message is removed.
This is demonstrated by adding the following to test_credit_flow_bytes in
message.py:
# Check for bug that allowed a small message to be hidden by a larger
one.
session.message_transfer(message=Message(session.delivery_properties(routing_key="q"),
"toobigtoobigtoobigtoobig"))
session.message_transfer(message=Message(session.delivery_properties(routing_key="q"),
"abcdefgh"))
session.message_flow(unit = session.credit_unit.byte, value = msg_size,
destination = "c")
try:
q.get(timeout = 1) # Should fail, message is too big.
self.fail("Expected Empty exception")
except Empty: None
# Create another consumer to remove the large message
session.message_subscribe(queue = "q", destination = "c2")
session.message_flow(unit = session.credit_unit.byte, value =
0xFFFFFFFFL, destination = "c2")
session.message_flow(unit = session.credit_unit.message, value = 1,
destination = "c2")
self.assertDataEquals(session, session.incoming("c2").get(timeout=1),
"toobigtoobigtoobigtoobig")
# Now the first consumer should be able to receive the smaller message.
self.assertDataEquals(session, q.get(timeout = 1), "abcdefgh")
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