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https://issues.apache.org/jira/browse/AMQ-6436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15503730#comment-15503730
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Christopher L. Shannon commented on AMQ-6436:
---------------------------------------------

This happens because the temporary store is lazily initialized the first time 
it is needed which is only after there are enough non-persistent messages to 
fill up memory so that the messages need to be dumped to disk.  So on restart 
the old directory isn't touched until initialization.  However, it probably 
wouldn't hurt to clear out the temp store directory on first start up.

> tmp_storage folder not cleaned on startup
> -----------------------------------------
>
>                 Key: AMQ-6436
>                 URL: https://issues.apache.org/jira/browse/AMQ-6436
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.13.3
>         Environment: Windows/RHEL 6.8 tested
>            Reporter: Reid Sommerville
>         Attachments: JMSTmpStor.java, message.txt
>
>
> saw this on our production servers, activemq failed to start due to no space 
> on the mount where tmp_storage was located. Reproduced it on a local windows 
> machine.
> start a default activemq broker at the command line.
> Run the attached code enough times to cause activemq to start writing to the 
> the tmp_storage folder, in my case 10000 messages was enough to give me 513Mb 
> in tmp_storage
> restart activemq and note that the contents of the tmp_storage folder are 
> still intact. 



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