If the IP address or hostname of a data node changes
A)The namenode updates the mapping between file name and block name
B)The data in that data node is lost forever
C)The namenode need not update mapping between file name and block name
D)There namenode has to be restarted

Question

Quizplus · Accepted Answer

The namenode manages the filesystem namespace and maintains the mapping between files and blocks; it does not need to update this mapping if a data node's IP address or hostname changes, as these details are not part of the file-to-block mapping. The system handles data node identification and communication through other mechanisms, such as registration and heartbeats from data nodes.

If the IP Address or Hostname of a Data Node