I agree with Amar and James, if you require permissions for your project, then 1. create a group in linux for your user. 2. give group write access to all files in HDFS. (hadoop dfs -chmod -R g+w / - or sth, I'm not totally sure.) 3. change group ownership of all files in HDFS. (hadoop dfs -chgrp -R <your_group_name> / - I'm not totally sure again..)
cheers, Rasit 2009/2/12 james warren <ja...@rockyou.com>: > Like Amar said. Try adding > > <property> > <name>dfs.permissions</name> > <value>false</value> > </property> > > > to your conf/hadoop-site.xml file (or flip the value in hadoop-default.xml), > restart your daemons and give it a whirl. > > cheers, > -jw > > On Wed, Feb 11, 2009 at 8:44 PM, Amar Kamat <ama...@yahoo-inc.com> wrote: > >> bjday wrote: >> >>> Good morning everyone, >>> >>> I have a question about correct setup for hadoop. I have 14 Dell >>> computers in a lab. Each connected to the internet and each independent of >>> each other. All run CentOS. Logins are handled by NIS. If userA logs into >>> the master and starts the daemons and UserB logs into the master and wants >>> to run a job while the daemons from UserA are still running the following >>> error occurs: >>> >>> copyFromLocal: org.apache.hadoop.security.AccessControlException: >>> Permission denied: user=UserB, access=WRITE, >>> inode="user":UserA:supergroup:rwxr-xr-x >>> >> Looks like one of your files (input or output) is of different user. Seems >> like your DFS has permissions enabled. If you dont require permissions then >> disable it else make sure that the input/output paths are under your >> permission (/user/userB is the hone directory for userB). >> Amar >> >> >>> what needs to be changed to allow UserB-UserZ to run their jobs? Does >>> there need to be a local user the everyone logs into as and run from there? >>> Should Hadoop be ran in an actual cluster instead of independent computers? >>> Any ideas what is the correct configuration settings that allow it? >>> >>> I followed Ravi Phulari suggestions and followed: >>> >>> http://hadoop.apache.org/core/docs/current/quickstart.html >>> >>> http://www.michael-noll.com/wiki/Running_Hadoop_On_Ubuntu_Linux_(Multi-Node_Cluster)< >>> http://www.michael-noll.com/wiki/Running_Hadoop_On_Ubuntu_Linux_%28Multi-Node_Cluster%29> >>> >>> >>> http://www.michael-noll.com/wiki/Running_Hadoop_On_Ubuntu_Linux_(Single-Node_Cluster)< >>> http://www.michael-noll.com/wiki/Running_Hadoop_On_Ubuntu_Linux_%28Single-Node_Cluster%29> >>> >>> >>> These allowed me to get Hadoop running on the 14 computers when I login >>> and everything works fine, thank you Ravi. The problem occurs when >>> additional people attempt to run jobs simultaneously. >>> >>> Thank you, >>> >>> Brian >>> >>> >> > -- M. Raşit ÖZDAŞ
