IMHO, there is no straight forward way of doing this in Hadoop except that you need to install Hadoop components such as MapReduce and HDFS as different users . This is an ongoing development priority. The available access related configuration options (before Kerberos V5) are :
- dfs.permissions = true|false - dfs.web.ugi = webuser,webgroup - dfs.permissions.supergroup = supergroup - dfs.upgrade.permission = 777 - dfs.umask = 022 However, with Kerberos V5 availability there seems to be some hope wrt user authentication. In this model, HDFS uses the same permissions model as before but a user can no longer trivially impersonate other users and there is provisioning for ACLs to specify who can do what wrt jobs, tasks (authorization). Perhaps, you can try Yahoo's distribution or Cloudera's CDH3b3 to evaluate current status on this. ~ Pavan On Fri, Oct 29, 2010 at 11:47 AM, Adarsh Sharma <adarsh.sha...@orkash.com>wrote: > Hi all, > As all of us know that Hadoop considers the user who starts the hadoop > cluster as superuser. > It provides all access to HDFS to that user. > > But know I want to know that how we can R/W access to new user for e.g Tom > to access HDFS. > Is there any command or we can write code for it. I read the tutorial but > not able to succed . > > Thanks in Advance >
