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https://issues.apache.org/jira/browse/QPIDJMS-552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17435523#comment-17435523
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ASF GitHub Bot commented on QPIDJMS-552:
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franz1981 edited a comment on pull request #44:
URL: https://github.com/apache/qpid-jms/pull/44#issuecomment-953989682
> Ok. It seemed like you wanted to make it the default.
I didn't said it clearly on the PR, but I don't want to break existing users
code :)
https://github.com/apache/qpid-jms/pull/45 is using a ref counted approach
that would GC the shared "resource" after all JMSSession that need it have been
closed; I'm opened to other approaches, but it's not clear to me (yet) which
class should decide the lifecycle of the shared completion thread pool, any
idea is welcome eg connection factory finalization looks appeaking (on Artemis
JMS impl we do that), but I'm not a big fan of finalizers :P
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> JMS 2 Completion threads shouldn't scale with the number of sessions
> --------------------------------------------------------------------
>
> Key: QPIDJMS-552
> URL: https://issues.apache.org/jira/browse/QPIDJMS-552
> Project: Qpid JMS
> Issue Type: Bug
> Components: qpid-jms-client
> Affects Versions: 1.3.0
> Reporter: Francesco Nigro
> Priority: Major
>
> JMS 2 Completion threads are now tied to be one per JMS Session ie a client
> application with N JMS sessions need N completion threads to handle the
> completion events.
> Given that the asynchronous model of JMS 2 allows users to have few threads
> handling many JMS sessions, should be better to reduce the amount of
> completion threads without exceeding the number of available cores and
> shrink/grow according to the completion event processing load.
> If the user confine a connection in a thread handling many JMS sessions and
> the completion events are issued by the same Netty thread in sequence, if the
> completion processing for a JMS Session is fast enough, next JMS Sessions can
> reuse existing completion threads instead of using a new one.
> This model save using too many completion threads for users tasks that are
> supposed to be very fast: if the user task cause a specific JMS Session
> completion thread to block, the expectation is that the system should be able
> to create a new completion thread to handle other JMS Session completion
> events, as expected.
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