[jira] [Commented] (QPID-7012) Connections producing lots of non-transactional persistent messages can cause other transactions to be delayed/time out

["Keith Wall (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/QPID-7012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15126235#comment-15126235 ] 

Keith Wall commented on QPID-7012:
----------------------------------

One possibility is that the Broker should force a sync after completing the current work for a connection, if non-transaction persistent work was included in the work.  This would have the affect of limiting the amount of non-transactional persistent work that can accumulate and will mean that transactions are never delayed too much.




> Connections producing lots of non-transactional persistent messages can cause other transactions to be delayed/time out
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: QPID-7012
>                 URL: https://issues.apache.org/jira/browse/QPID-7012
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Broker
>            Reporter: Keith Wall
>
> Work mixes that include
> * connection producing large numbers of persistent messages *without* transactions 
> * transactional work
> may see timeouts in some situations.  
> In the HA case, the non-transaction messages are sent to the replicas lazily, so all replicas may get behind.  This means the a transaction will need to wait for the replicas catch up before its transaction completes.
> In the non-HA (and HA on the master), the commit related to the transactional work may queue behind the commit jobs related to the non-transactional work.
> This problem affects only publishes using unconfirmed publishes, currently the defect for AMQP 0-8..0-91 on in the Java Client.



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