Description of problem:

There are cases where messages on a paged queue are not delivered to consumers due to the page they are in not being loaded at the time it is examined for messages to send.

Version-Release number of selected component (if applicable):

Early Access

How reproducible:

100%

Scenario 1:

Steps to Reproduce:
1. create paged queue with qpid.max_pages_loaded=1
2. send a 100,000 1024 byte messages to this queue
3. retrieve all the messages

Actual results:

Not all the messages are retrieved

Expected results:

All the messages should be retrieved

Scenario 2:

Steps to Reproduce:
1. create paged queue with default settings
2.a. send a 10,000 1024 byte messages with property colour set to blue
2.b. send a 10,000 1024 byte messages with property colour set to red
2.c. send a 10,000 1024 byte messages with property colour set to blue
2.d. send a 5,000 1024 byte messages with property colour set to yellow
2.e. send a 10,000 1024 byte messages with property colour set to blue
2.f. send a 10,000 1024 byte messages with property colour set to red
3. retrieve messages by colour using a selector, e.g.
   "paged-queue; {mode:browse, link:{selector:\"colour = 'blue'\"}}"
   first take all blue messages, then red messages, then yellow messages 

Actual results:

Yellow messages are not retrieved

Expected results:

All the messages should be retrieved

Additional info: