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Date: Tue, 11 Sep 2012 06:42:08 +1100 (NCT)
From: "Hudson (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3907) Allow multiple users for local block
 readers
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    [ https://issues.apache.org/jira/browse/HDFS-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452356#comment-13452356 ] 

Hudson commented on HDFS-3907:
------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #2737 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/2737/])
    HDFS-3907. Allow multiple users for local block readers. Contributed by Eli Collins (Revision 1383031)

     Result = FAILURE
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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