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https://issues.apache.org/jira/browse/HADOOP-15070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-15070.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 3.1.0

it does apply to trunk, I just need to be in the right directory to apply the 
patch :)

> add test to verify FileSystem and paths differentiate on user info
> ------------------------------------------------------------------
>
>                 Key: HADOOP-15070
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15070
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs, test
>    Affects Versions: 2.8.2
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>             Fix For: 3.1.0
>
>         Attachments: HADOOP-15070-001.patch
>
>
> Add a test to verify that userinfo data is (correctly) used to differentiate 
> the entries in the FS cache, so are treated as different filesystems.
> * This is criticalk for wasb, which uses the username to identify the 
> container, in a path like {{wasb:contain...@stevel.azure.net}}. This works in 
> Hadoop, but SPARK-22587 shows that it may not be followed everywhere (and 
> given there's no documentation, who can fault them?)
> * AbstractFileSystem.checkPath looks suspiciously like it's path validation 
> just checks host, not authority. That needs a test too.
> * And we should cut the @LimitedPrivate(HDFS, Mapreduce) from 
> Path.makeQualified. If MR needs it, it should be considered open to all apps 
> using the Hadoop APIs. Until I looked at the code I thought it was...



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