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Date: Tue, 11 Sep 2012 05:17:08 +1100 (NCT)
From: "Aaron T. Myers (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=13452266#comment-13452266 ] 

Aaron T. Myers commented on HDFS-3907:
--------------------------------------

+1, the patch looks good to me.
                
> 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
>         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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