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https://issues.apache.org/jira/browse/HDFS-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452334#comment-13452334
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Hudson commented on HDFS-3907:
------------------------------

Integrated in Hadoop-Common-trunk-Commit #2713 (See 
[https://builds.apache.org/job/Hadoop-Common-trunk-Commit/2713/])
    HDFS-3907. Allow multiple users for local block readers. Contributed by Eli 
Collins (Revision 1383031)

     Result = SUCCESS
eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1383031
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* 
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
* 
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestShortCircuitLocalRead.java

                
> Allow multiple users for local block readers
> --------------------------------------------
>
>                 Key: HDFS-3907
>                 URL: https://issues.apache.org/jira/browse/HDFS-3907
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>             Fix For: 2.0.2-alpha
>
>         Attachments: hdfs-3907.txt
>
>
> The {{dfs.block.local-path-access.user}} config added in HDFS-2246 only 
> supports a single user, however as long as blocks are group readable by more 
> than one user the feature could be used by multiple users, to support this we 
> just need to allow both to be configured. In practice this allows us to also 
> support HBase where the client (RS) runs as the hbase system user and the DN 
> runs as hdfs system user. I think this should work secure as well since we're 
> not using impersonation in the HBase case.

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