Planning the cluster, deciding on the number of nodes based on the estimated amount of data the cluster is going to serve.
Installing and upgrading Apache Hadoop on a cluster.
Configuring and tuning Hadoop using the various configuration files available within Hadoop.
An understanding of all the Hadoop daemons along with their roles and responsibilities in the cluster.
The administrator should know how to read and interpret Hadoop logs.
Adding and removing nodes in the cluster.
Rebalancing nodes in the cluster.
Employ security using an authentication and authorization system such as Kerberos.
Almost all organizations follow the policy of backing up their data and it is the responsibility of the administrator to perform this activity. So, an administrator should be well versed with backups and recovery operations of servers.
