JAkub Scholz created QPID-5322:
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Summary: 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
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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