[jira] [Created] (QPIDJMS-385) Consumer\Receiver issue with prefetch > 1

["Alessandro Crotti (JIRA)" <ji...@apache.org>]

Alessandro Crotti created QPIDJMS-385:
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             Summary: Consumer\Receiver issue with prefetch > 1
                 Key: QPIDJMS-385
                 URL: https://issues.apache.org/jira/browse/QPIDJMS-385
             Project: Qpid JMS
          Issue Type: Bug
          Components: qpid-jms-client
    Affects Versions: 0.11.1
         Environment: I tested this on Windowos Server 2012 R2 and as broker I used Apache QPID Broker 7.0.0
            Reporter: Alessandro Crotti


Using Qpid JMS 0.11.1 AMQP 1.0 client, which is the latest version for Java 7, I experienced an issue when you set prefetch > 1 and start consuming messages from a queue in asynchronous mode, using "onMessage()" method and sessionMode = Session.CLIENT_ACKNOWLEDGE.

Taking prefetch= 10 as example, I noticed that:
 # When you open connection/session/listener, the client sends a "flow" performative with linkCredit=10, which is correctly the prefetch value. Prefetched messages = 10
 # The client starts to process the first message received using class "MessageDeliverTask" method "run()" (all inside JmsMessageConsumer.java)
 # There is a call "ackFromReceive(envelope)" at row 667 which, following sub-calls, will call method "sendFlowIfNeeded()" of class "AmqpConsumer"
 # in this method "newCredit" is calculated to send a new "flow" performative. Here the calculation doesn't check how many prefetched messages already are on client side. The currentCredit is 0, for this reason is sent a "flow" performative with linkCredit=10. Prefetched messages =20
 # There is a call "messageListener.onMessage(copy);" at row 672 which triggers the import of the message. Then the prefetched messages = 19.
 # The process starts again from point 2 increasing constantly the prefetched messages collected on client side, causing timeout issues because if they are 1 million of messages, the client can't process them before they expire

I compared code of method "sendFlowIfNeeded()" (see point 3) in version 0.11.1 with the code of version 0.31.0: in version 0.31.0 the code is changed and the calculation considers also "prefetchMessageCount".

Could this be fixed for Java 7?



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