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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2246) Shortcut a local client reads to a Datanodes files directly
Date Wed, 21 Sep 2011 18:51:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13109771#comment-13109771
] 

Suresh Srinivas commented on HDFS-2246:
---------------------------------------

After thinking a bit more about this, I realized the current solution is hard to use. Changing
hbase to run from hbase user to hdfs user requires changing the ownership of all the HDFS
files from hbase to hdfs. This is cumbersome.

Another solution is to consider group based access.
# A group is created with hbase and hdfs in it
# A configuration option on HDFS is added for allowing short circuit access set to group and
user for which it is allowed.
# When this config option is set, datanode during startup modifies storage directories and
files read access to the configured group.
# Datanode#getPathInfo() allows the method call for the user configured in config option.
# Client still use the keberos authentication to maintain a single RPC proxy, as proposed
earlier.



> Shortcut a local client reads to a Datanodes files directly
> -----------------------------------------------------------
>
>                 Key: HDFS-2246
>                 URL: https://issues.apache.org/jira/browse/HDFS-2246
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Sanjay Radia
>         Attachments: 0001-HDFS-347.-Local-reads.patch, HDFS-2246.20s.1.patch, HDFS-2246.20s.2.txt,
HDFS-2246.20s.3.txt, HDFS-2246.20s.4.txt, HDFS-2246.20s.patch, localReadShortcut20-security.2patch
>
>


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