Erik Krogen updated HDFS-10872:
    Attachment: HDFS-10872.002.patch

Attaching v002 patch addressing findbugs and checkstyle. Unit test failure 
doesn't seem related; passes fine locally. 

> Add MutableRate metrics for FSNamesystemLock operations
> -------------------------------------------------------
>                 Key: HDFS-10872
>                 URL: https://issues.apache.org/jira/browse/HDFS-10872
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Erik Krogen
>            Assignee: Erik Krogen
>         Attachments: FSLockPerf.java, HDFS-10872.000.patch, 
> HDFS-10872.001.patch, HDFS-10872.002.patch
> Add metrics for FSNamesystemLock operations to see, overall, how long each 
> operation is holding the lock for. Use MutableRate metrics for now. 

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