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.
Hadoop has a native implementation for certain components, but sometimes it does not load automatically.
Update Hadoop heartbeat interval to mark data node as dead at the predefined period of time depending on your requirement.
Validate Hadoop configuration XML files.