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https://issues.apache.org/jira/browse/HDFS-3582?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eli Collins updated HDFS-3582:
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    Attachment: hdfs-3582.txt

Good point Colin, updated the javadoc to indicate as such.
                
> Hook System.exit in MiniDFSCluster
> ----------------------------------
>
>                 Key: HDFS-3582
>                 URL: https://issues.apache.org/jira/browse/HDFS-3582
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: test
>    Affects Versions: 2.0.0-alpha
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>            Priority: Minor
>         Attachments: hdfs-3582.txt, hdfs-3582.txt, hdfs-3582.txt, 
> hdfs-3582.txt
>
>
> Occasionally the tests fail with "java.util.concurrent.ExecutionException: 
> org.apache.maven.surefire.booter.SurefireBooterForkException:
> Error occurred in starting fork, check output in log" because the NN is 
> exit'ing (via System.exit or Runtime.exit). Unfortunately Surefire doesn't 
> retain the log output (see SUREFIRE-871) so the test log is empty, we don't 
> know which part of the test triggered which exit in HDFS. To make this 
> debuggable, let's hook this in MiniDFSCluster  via installing a security 
> manager that overrides checkExit (ala TestClusterId) or mock out System.exit 
> in the code itself. I think the former is preferable though we'll need to 
> keep the door open for tests that want to set their own security manager 
> (should be fine to override this one some times).

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