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https://issues.apache.org/jira/browse/KAFKA-3925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16044002#comment-16044002
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Paolo Patierno commented on KAFKA-3925:
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In my opinion, putting the log in /tmp is great for all developers who start to 
use Kafka or for testing as well. They don't need to remember to delete such 
logs after "playing" around with Kafka. I think that as default is good. If 
people need persistence of such logs, they should change the logs dir. I think 
that just warning on startup could be enough. 

> Default log.dir=/tmp/kafka-logs is unsafe
> -----------------------------------------
>
>                 Key: KAFKA-3925
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3925
>             Project: Kafka
>          Issue Type: Bug
>          Components: config
>    Affects Versions: 0.10.0.0
>         Environment: Various, depends on OS and configuration
>            Reporter: Peter Davis
>
> Many operating systems are configured to delete files under /tmp.  For 
> example Ubuntu has 
> [tmpreaper|http://manpages.ubuntu.com/manpages/wily/man8/tmpreaper.8.html], 
> others use tmpfs, others delete /tmp on startup. 
> Defaults are OK to make getting started easier but should not be unsafe 
> (risking data loss). 
> Something under /var would be a better default log.dir under *nix.  Or 
> relative to the Kafka bin directory to avoid needing root.  
> If the default cannot be changed, I would suggest a special warning print to 
> the console on broker startup if log.dir is under /tmp. 
> See [users list 
> thread|http://mail-archives.apache.org/mod_mbox/kafka-users/201607.mbox/%3cCAD5tkZb-0MMuWJqHNUJ3i1+xuNPZ4tnQt-RPm65grxE0=0o...@mail.gmail.com%3e].
>   I've also been bitten by this. 



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