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https://issues.apache.org/jira/browse/QPID-2703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13152096#comment-13152096
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Rajith Attapattu commented on QPID-2703:
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Part of the reason is in the java client completions are tied to accepts.
See https://reviews.apache.org/r/2853/
> Transaction Rollback/Recover does not restore consumer credit
> -------------------------------------------------------------
>
> Key: QPID-2703
> URL: https://issues.apache.org/jira/browse/QPID-2703
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.6, 0.8, 0.10, 0.12, 0.14, 0.15
> Reporter: Martin Ritchie
> Assignee: Keith Wall
> Fix For: 0.15
>
>
> When a transaction rollback/recover occurs on the 0-8/0-9/0-91 code path the
> messages are put back on to the queue but the subscriber is not credited for
> them. This can be seen with a small prefetch. The credit is lost and the
> client starves. Adding a restoreCredit call in the message release will
> address this issue.
> The same issue exists in 0-10 code path but for *different* reasons. On
> 0-10, a client is required to complete commands. The Java client currently
> fails to complete the message.transfer commands that correspond to those
> messages that must be returned to the Broker due to the rollback/recover and
> for this reason the Brokers are failing to recredit. This problem is
> evident when using the Java Broker, but is masked when using the CPP Broker
> (by a credit window issue that results in the Broker expanding credit window
> beyond the requested limit).
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