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Posted to dev@qpid.apache.org by "Robbie Gemmell (JIRA)" <ji...@apache.org> on 2018/05/17 10:33:00 UTC
[jira] [Resolved] (QPIDJMS-385) Consumer\Receiver issue with
prefetch > 1
[ https://issues.apache.org/jira/browse/QPIDJMS-385?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robbie Gemmell resolved QPIDJMS-385.
------------------------------------
Resolution: Duplicate
Asked and answered on the mailing list previously:
https://lists.apache.org/thread.html/769ab655fb16037ce8a9cef9a5f11cb65af201c038c3fbbb87317d74@%3Cdev.qpid.apache.org%3E
> 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
> Priority: Major
>
> 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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