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https://issues.apache.org/jira/browse/AMQ-3573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13143029#comment-13143029
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Torsten Mielke commented on AMQ-3573:
-------------------------------------
Thanks for your input Gary.
I have repeatedly seen companies deploying ActiveMQ in production where the
underlying disk had only 10-30 GB of free space left.
Just this week I found a company that deployed ActiveMQ with almost default
settings (commented <systemUsage> in ActiveMQ) and they only had 6 GB of hard
disk space available.
I believe this happens fairly often.
I can see that the limits I proposed may seem a bit low but assuming there will
be up to 110GB disk space available by default may be too much?
Also, this will not be apparent from looking at the default conf (see
AMQ-3574). So I presume most users of ActiveMQ are unaware of these high
default limits.
> Hardcoded defaults for systemUsage not suitable for out of the box
> -------------------------------------------------------------------
>
> Key: AMQ-3573
> URL: https://issues.apache.org/jira/browse/AMQ-3573
> Project: ActiveMQ
> Issue Type: Improvement
> Components: Broker
> Affects Versions: 5.5.1
> Reporter: Torsten Mielke
> Labels: default, systemUsage
> Attachments: AMQ-3573.patch
>
>
> Right now the default activemq.xml has the entire <systemUsage> section
> commented out. If commented, then the default systemUsage as defined in
> BrokerService.getSystemUsage() applies and uses these limits:
> memoryLimit 64 MB
> storeLimit: 10 GB
> tempLimit: 100 GB
> I don't think these are good default values as in the worst case the broker
> may use 110 GB of disk space. Many runtime environments will not have that
> much disk space and are therefore in danger of running out of disk space
> completely.
> IMHO some more sensitive defaults would be
> memoryLimit 64 MB
> storeLimit: 1 GB
> tempLimit: 1 GB
> to prevent the broker from using too much disk space by default.
> I believe most users of ActiveMQ are unaware of these defaults and probably
> don't expect the broker to use up to 110 GB of their disk.
> If anyone really needs large store and temp limit, they should explicitly
> configure for it.
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