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https://issues.apache.org/jira/browse/PROTON-255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13592496#comment-13592496
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Ken Giusti commented on PROTON-255:
-----------------------------------
Pushed the workaround for now - harmless and prevents the stall.
svn.apache.org/viewvc?view=revision&revision=1452439
Leaving bug open in lieu of better fix.
> Messenger stall in send(): frames buffered in transport not written to driver.
> ------------------------------------------------------------------------------
>
> Key: PROTON-255
> URL: https://issues.apache.org/jira/browse/PROTON-255
> Project: Qpid Proton
> Issue Type: Bug
> Components: proton-c
> Affects Versions: 0.4
> Reporter: Ken Giusti
> Priority: Blocker
>
> I've created a simple "ping-pong" test between two Messenger clients. One
> client sends 10k messages to the other, which replies. The test stalls after
> sending 10 messages in each direction, which is the value used for link
> credit.
> The cause of the problem is that the FLOW frame sent by one client is not be
> received by the other. The failure is due to the FLOW frame remaining
> buffered in the sender's transport buffer, not being written to the driver.
> The driver is waiting for socket activity, and never "sees" the pending
> output sitting in the transport.
> This bug appears to have been introduced by PROTON-225
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