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https://issues.apache.org/jira/browse/QPID-7394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15486865#comment-15486865
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ASF subversion and git services commented on QPID-7394:
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Commit 1760522 from [~lorenz.quack] in branch 'java/trunk'
[ https://svn.apache.org/r1760522 ]
QPID-7394: [Java Client, AMQP 0-8..0-91] Correct prefetch accounting when
client ack session is recovered
> [0-8..0-91] Prefetch accounting incorrect when message rolled back
> ------------------------------------------------------------------
>
> Key: QPID-7394
> URL: https://issues.apache.org/jira/browse/QPID-7394
> Project: Qpid
> Issue Type: Bug
> Components: Java Client
> Affects Versions: 0.32, qpid-java-6.0, qpid-java-6.0.4
> Reporter: Keith Wall
> Fix For: qpid-java-6.0.5, qpid-java-6.1
>
> Attachments:
> 0001-QPID-7394-Java-Client-0-8.0-91-Prevent-the-client-fr.patch
>
>
> When the application calls {{Session#receive()}}, the client will
> automatically open the prefetch window by 1 message if necessary (QPID-6088).
> On committing the received message, the client takes care to revert the
> prefetch level back to the session's default value. However, if the
> application calls rollback, the client fails to account for the increased
> credit, so when the application calls #receive again, the prefetch window
> will be opened further.
> If the downstream application experiences some kind of failure meaning it
> rolls back every message, this could potentially lead to the prefetch buffer
> growing large. If the queue is deep, this could cause excessive network
> utilisation (as large numbers of messages are continually received/rejected)
> and excessive memory use on the client.
> -This defect also allows a Broker defect to manifest - QPID-7387.-
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