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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3907) Allow multiple users for local block readers
Date Wed, 29 Jan 2014 03:32:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13884962#comment-13884962

Hadoop QA commented on HDFS-3907:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5973//console

This message is automatically generated.

> 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: datanode
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>             Fix For: 2.3.0
>         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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