Need help on user and its access in HDFS. In HDP2.5 , while working on HDFS authorization with Apache Ranger, I found , am unable to change file permission as a root user. Can someone please help what would be the user and its default access credentials. [root@sandbox ~]# hdfs dfs -ls /user Found 16 items drwxr-xr-x - admin hdfs 0 2017-01-11 08:28 /user/admin drwxrwx--- - ambari-qa hdfs 0 2016-10-25 07:47 /user/ambari-qa drwxr-xr-x - amy_ds hdfs 0 2016-10-25 08:02 /user/amy_ds drwxr-xr-x - hbase hdfs 0 2016-10-25 07:48 /user/hbase drwxr-xr-x - hcat hdfs 0 2016-10-25 07:51 /user/hcat drwxr-xr-x - hive hdfs 0 2017-01-19 13:25 /user/hive drwxr-xr-x - holger_gov hdfs 0 2016-10-25 08:03 /user/holger_gov drwxrwxr-x - livy hdfs 0 2016-10-25 07:49 /user/livy drwxr-xr-x - maria_dev hdfs 0 2017-01-05 14:35 /user/maria_dev drwxrwxr-x - oozie hdfs 0 2016-10-25 07:52 /user/oozie drwxr-xr-x - raj_ops hdfs 0 2017-01-11 08:29 /user/raj_ops drwx------ - root hdfs 0 2017-01-19 10:34 /user/root drwxrwxr-x - spark hdfs 0 2016-10-25 07:48 /user/spark drwxr-xr-x - vz_all hdfs 0 2017-01-12 10:58 /user/vz_all drwxr-xr-x - vz_vdsi hdfs 0 2017-01-19 14:18 /user/vz_vdsi drwxr-xr-x - zeppelin hdfs 0 2016-10-25 07:50 /user/zeppelin [root@sandbox ~]# hdfs dfs -chmod -R 700 /user/hive 17/01/31 12:11:18 WARN retry.RetryInvocationHandler: Exception while invoking ClientNamenodeProtocolTranslatorPB.setPermission over null. Not retrying because try once and fail. org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.AccessControlException): Permission denied. user=root is not the owner of inode=hive at org.apache.hadoop.fs.FsShell.main(FsShell.java:350) chmod: changing permissions of '/user/hive': Permission denied. user=root is not the owner of inode=hive [root@sandbox ~]# exit am trying to follow instructions mentioned in below URL. http://hortonworks.com/blog/best-practices-in-hdfs-authorization-with-apache-ranger/ ... View more

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