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From "Torsten Mielke (Commented) (JIRA)" <>
Subject [jira] [Commented] (AMQ-3573) Hardcoded defaults for systemUsage not suitable for out of the box
Date Thu, 03 Nov 2011 10:21:32 GMT


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:
>             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

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