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From "Bikas Saha (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3096) dfs.datanode.data.dir.perm is set to 755 instead of 700
Date Thu, 15 Mar 2012 02:44:38 GMT
dfs.datanode.data.dir.perm is set to 755 instead of 700

                 Key: HDFS-3096
                 URL: https://issues.apache.org/jira/browse/HDFS-3096
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
    Affects Versions: 1.0.0, 0.23.0
            Reporter: Bikas Saha
            Assignee: Bikas Saha
             Fix For: 0.23.2, 1.0.2

dfs.datanode.data.dir.perm is used by the datanode to set the permissions of it data directories.
This is set by default to 755 which gives read permissions to everyone to that directory,
opening up possibility of reading the data blocks by anyone in a secure cluster. Admins can
over-ride this config but its sub-optimal practice for the default to be weak. IMO, the default
should be strong and the admins can relax it if necessary.
The fix is to change default permissions to 700.

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