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https://issues.apache.org/jira/browse/HDFS-827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977517#action_12977517
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Todd Lipcon commented on HDFS-827:
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I suppose so - I never remember to look in src/test/unit, though. What's the 
purpose of the distinction there? We have some tests there that take much 
longer than a second (eg TestBlockRecovery), and many tests in src/test/hdfs 
that are near instant.

To be clear, I understand the distinction between unit and functional test, but 
not how it actually makes a difference in our build :)

> Additional unit tests for FSDataset
> -----------------------------------
>
>                 Key: HDFS-827
>                 URL: https://issues.apache.org/jira/browse/HDFS-827
>             Project: Hadoop HDFS
>          Issue Type: Test
>          Components: data-node, test
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-827.txt
>
>
> FSDataset doesn't currently have a unit-test that tests it in isolation of 
> the DN or a cluster. A test specifically for this class will be helpful for 
> developing HDFS-788

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