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https://issues.apache.org/jira/browse/QPID-5322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gordon Sim reassigned QPID-5322:
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Assignee: Gordon Sim
> Allow changes to the queue paging configuration, especially the
> qpid.max_pages_loaded argument
> ----------------------------------------------------------------------------------------------
>
> Key: QPID-5322
> URL: https://issues.apache.org/jira/browse/QPID-5322
> Project: Qpid
> Issue Type: Bug
> Components: C++ Broker
> Affects Versions: 0.25
> Reporter: JAkub Scholz
> Assignee: Gordon Sim
>
> When a queue is configured to use paging, the values used when the queue is
> created are fixed. IT is not possible to modify them later without dropping
> the queue and creating a new one and that isn't exactly comfortable,
> especially when the queue contains some messages.
> It would be therefore nice to have a possibility to change some attributes of
> the existing queue - either "on the go" when the broker is running or at
> least when the broker is switched off (similarly to the queue journal files
> resizing utility).
> Obviously, it might not be possible to decrease the qpid.page_factor option
> if the queue already contains some messages bigger then the new page size.
> But changing the value of the qpid.max_pages_loaded might be relatively
> straight forward, especially when the broker is switched off, because the
> paging file is recreated during the broker startup.
> The possibility to change the qpid.max_pages_loaded parameter is important.
> If your broker runs out of memory because its queues contain too many
> messages it will crash. Right now, there is often no solution, because if you
> restart the broker it will run out of memory again before you get it online.
> But with the possibility to change the qpid.max_pages_loaded, you would be
> able to decrease the amount of used memory after it crashed and thus start
> the broker again (of course as long as you have been using paged queues
> already before).
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