[jira] [Created] (KAFKA-3925) Default log.dir=/tmp/kafka-logs is unsafe

["Peter Davis (JIRA)" <ji...@apache.org>]

Peter Davis created KAFKA-3925:
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             Summary: 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=0o9VQ@mail.gmail.com%3e).  I've also been bitten by this. 



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