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https://issues.apache.org/jira/browse/HADOOP-8228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242643#comment-13242643
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Aaron T. Myers commented on HADOOP-8228:
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This is some great cleanup, Todd. The new test/testing API look good.

One question: are you positive that the ordering of the two @After methods 
either doesn't matter, or is guaranteed to happen in the right order?

One comment: maybe use a deterministic random seed for the Random instances 
you're using? Or at least log the amount of time that the test is sleeping for 
and what it's throwing? I realize that the test won't be deterministic 
regardless, but it will be really tough to try to reproduce test failures 
caused by a particular ZK disconnect pattern or health check failure pattern if 
we have no idea what that pattern was.

+1 once those are addressed
                
> Auto HA: Refactor tests and add stress tests
> --------------------------------------------
>
>                 Key: HADOOP-8228
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8228
>             Project: Hadoop Common
>          Issue Type: Test
>          Components: auto-failover, ha, test
>    Affects Versions: Auto Failover (HDFS-3042)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hadoop-8228.txt, hadoop-8228.txt, hadoop-8228.txt
>
>
> It's important that the ZKFailoverController be robust and not contain race 
> conditions, etc. One strategy to find potential races is to add stress tests 
> which exercise the code as fast as possible. This JIRA is to implement some 
> test cases of this style.

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