Perform HDFS audit logging.
Create Yarn nodes whitelist.
Save namespace on namenode and perform checkpoint on secondary namenode.
Inspect Hadoop configuration using command-line.
Mount HDFS as a local file system.
Create Hadoop data nodes whitelist.
The Hadoop cluster enters safe mode during the name node startup till the basic indicators are met and later in case of emergency, which means that the cluster enters read-only mode.
Decommission Yarn node with minimal impact on the running applications.
Decommission HDFS data node with minimal impact on the running applications.
Display Hadoop cluster report.