Performing routine tasks

As a Hadoop administrator, you must work on your routine activities. Let's go through some of the most common routine tasks that you would perform with Hadoop administration.

Working with safe mode

When any client performs a write operation on HDFS, the changes get recorded in the edit log. This edit log is flushed at the end of write operations and the information is synced across nodes. Once this operation is complete, the system returns a success flag to the client. This ensures consistency of data and cleaner operation execution. Similarly, name node maintains a fsimage file, which is a data structure that name node uses to keep track of what goes where. This is a checkpoint copy which is...