One evicted message out of two is delivered to the consumer
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Key: AMQ-2159
URL: https://issues.apache.org/activemq/browse/AMQ-2159
Project: ActiveMQ
Issue Type: Bug
Components: Broker
Affects Versions: 5.2.0
Environment: Windows Xp, Java 5, ActiveMQ 5.2
Reporter: Yannick
A problem in message eviction seems to cause a strange behavior of message
delivery. After a slow consumer consumed it's prefetched messages, it start
receiving one message out of two that were produced. When stepping into the
sources I noticed that one message evicted out of two is dispatched to the
destination even if no message have been consumed during that time. The problem
seems to be in the class 'TopicSubscription'. This is what I found:
- When a message is discarded dequeueCounter is incremented.
- Then next time a message arrives it is evicted then dispatchMatched is
called.
- Because dequeueCounter have been called without any message dispatched,
isFull() return false.
- As a result it assumes there is an empty room in the prefetch and dispatch
the message.
The following example show what I expect against what I get when I produce 100
messages with a unique ID then consume 10 message and output the message ID.
Prefetch size is 5.
Expected:
0, 1, 2, 3, 4, 95, 96, 97, 98, 99
What I really get
0, 1, 2, 3, 4, 5, 7, 9, 11, 13
I made a test application and a unit test, I didn't found how to attach it to
the issue.
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