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https://issues.apache.org/jira/browse/HDFS-11707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15989934#comment-15989934
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Allen Wittenauer commented on HDFS-11707:
-----------------------------------------

bq. It seems to work alright on Unix systems.

FWIW, OS X is a TOG certified UNIX(tm). 

bq. Perhaps something about HW specs? 

Perhaps.  It could also be the JVM, since DirectoryScanner is threaded. It 
might also be the file system buffer cache, IO read rate, clock skew, or any 
number of other things.

For the record, ran it twice on OS X 10.11.6 and Java 1.8.0_111 with no 
failure. But my laptop is also super busy.

> TestDirectoryScanner#testThrottling fails on OSX
> ------------------------------------------------
>
>                 Key: HDFS-11707
>                 URL: https://issues.apache.org/jira/browse/HDFS-11707
>             Project: Hadoop HDFS
>          Issue Type: Test
>          Components: test
>    Affects Versions: 2.8.0
>            Reporter: Erik Krogen
>            Priority: Minor
>
> In branch-2 and trunk, {{TestDirectoryScanner#testThrottling}} consistently 
> fails on OS X (I'm running 10.11 specifically) with:
> {code}
> java.lang.AssertionError: Throttle is too permissive
> {code}
> It seems to work alright on Unix systems.



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