broker delivers messages out of order
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Key: QPID-572
URL: https://issues.apache.org/jira/browse/QPID-572
Project: Qpid
Issue Type: Bug
Components: Java Broker
Reporter: Rafael H. Schloming
ConcurrentSelectorDeliveryManager will sometimes deliver messages out of order.
This is caused by the code in deliver(...) that attempts to short-circuit
message queuing when there is an available subscription. This code can result
in the currently published message skipping ahead of queued messages causing
out of order delivery. Although unrelated to transactions, I have observed this
failure occuring in TransactedTest both in testCommit and testRollback.
Normally it does not happen very frequently, however placing a
Thread.sleep(500) in the async delivery thread will cause the failure to occur
almost all the time.
I tried fixing the problem by only attempting synchronous delivery when there
are no queued messages, however this appears to break other tests that use
selectors. This makes me suspect that the selector implementation is somehow
incorrectly coupled to synchronous delivery.
I have only verfied this issue on the trunk, however I believe it effects M2 as
well.
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