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https://issues.apache.org/jira/browse/QPID-8749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18100733#comment-18100733
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ASF subversion and git services commented on QPID-8749:
-------------------------------------------------------

Commit d65a81b8130b729baaa1cd9a3f2bb09e3cdc5447 in qpid-broker-j's branch 
refs/heads/main from Daniil Kirilyuk
[ https://gitbox.apache.org/repos/asf?p=qpid-broker-j.git;h=d65a81b813 ]

QPID-8749: [Broker-J] AMQP connections may not close while processing pending 
writes (#423)

> [Broker-J] AMQP connections may not close while processing pending writes
> -------------------------------------------------------------------------
>
>                 Key: QPID-8749
>                 URL: https://issues.apache.org/jira/browse/QPID-8749
>             Project: Qpid
>          Issue Type: Bug
>          Components: Broker-J
>    Affects Versions: qpid-java-broker-10.0.1
>            Reporter: Daniil Kirilyuk
>            Priority: Minor
>             Fix For: qpid-java-broker-10.1.0
>
>
> Idle AMQP connections could not be closed sometimes, producing following 
> stacktraces in thread dumps:
> {code:java}
> "IO-/XX.XXX.XX.XXX:45532" #159java.lang.Thread.State: RUNNABLE
> cpu=169433659.40mselapsed=416877.64s
> at java.util.Collections.addAll(Collections.java:5867)at 
> org.apache.qpid.server.bytebuffer.QpidByteBufferFactory.write(...)at 
> org.apache.qpid.server.transport.NonBlockingConnection.writeToTransport(...)at
>  org.apache.qpid.server.transport.NonBlockingConnection.processPending(...) 
> {code}
> The issue seems to be caused by race condition when NonBlockingConnection 
> processes pending writes. In NonBlockingConnection#doWork() value of the 
> _closed variable may change between the check and  processPending() call. The 
> _scheduledTime is not reset and may become stale. Additionally the writing 
> process should be optimized by batching the byte buffers.



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