FAQ Database Discussion Community

Not able to create a directory in hadoop file system

Getting this problem while creating a directory in hadoop file system mkdir: Permission denied: user=ubuntu, access=WRITE, inode="/user/ubuntu":hdfs:supergroup:drwxr-xr-x

Cloudera installation failed to detect root privileges on CentOS

I tried to adding new host into the cluster o CentOS. It fails on install & gives "Installation failed. Failed to detect root privileges" in status. I know that Cloudera needs user to have passwordless privileges ("Root access to your hosts is required to install the Cloudera packages. This installer...

Change IP address of a Hadoop HDFS data node server and avoid Block pool errors

I'm using the cloudera distribution of Hadoop and recently had to change the IP addresses of a few nodes in the cluster. After the change, on one of the nodes (Old IP:, New IP: the following error comes up when I try to start the data node service. Initialization...

How do I debug a failing cloudera-scm-server process?

I am trying to install Cloudera Manager 5 on centOS6, but the cloudera-scm-server process keeps failing without a clear error in the logs. service --status-all cloudera-scm-agent (pid 7058) is running... cloudera-scm-server dead but pid file exists pg_ctl: server is running (PID: 13650) /usr/bin/postgres "-D" "/var/lib/cloudera-scm-server-db/data" cat /var/log/cloudera-scm-server/cloudera-scm-server.out JAVA_HOME=/usr/java/jdk1.7.0_67-cloudera Killed (core...