[jira] [Created] (MAPREDUCE-7111) TestNameNodeMetrics fails on Windows

["Zuoming Zhang (JIRA)" <ji...@apache.org>]

Zuoming Zhang created MAPREDUCE-7111:
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             Summary: TestNameNodeMetrics fails on Windows
                 Key: MAPREDUCE-7111
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7111
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: test
    Affects Versions: 2.9.1, 3.1.0
            Reporter: Zuoming Zhang
            Assignee: Zuoming Zhang
             Fix For: 2.9.1, 3.1.0


_TestNameNodeMetrics_ fails on Windows

 

Problem:

This is because in _testVolumeFailures_, it tries to call _DataNodeTestUtils.injectDataDirFailure_ on a volume folder. What _injectDataDirFailure_ does is actually modifying the folder name from _volume_name_ to _volume_name_._origin_ and create a new file named as _volume_name_. Inside the folder, it has two things: 1. a directory named as "_current_", 2. a file named as "_in_use.lock_". Windows behaves different from Linux when renaming the parent folder of a locked file. Windows prevent you from renaming while Linux allows.

Fix:

So in order to inject data failure on to the volume. Instead of renaming the volume folder itself. Rename the folder inside it which doesn't hold a lock. Since the folder inside the volume is "_current_". Then we only need to inject data failure to _volume_name/current_.



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