Question

In namenode ha, when active node fails, which node takes the responsibility of active node

Answer 1

If Active NameNode fails, then passive NameNode takes all the responsibility of active node and cluster continues to work. Issues in maintaining consistency in the HDFS High Availability cluster are as follows: ... This permit to reinstate the Hadoop cluster to the same namespace state where it got crashed.

Answer 2

• When active node fails, then Passive node takes the responsibility of active node.
• Passive node is also called standby namenode that takes the responsibility to remove the problem of single point of failure (SPOF).
• It contains Checkpoints on their local file systems by downloading fsimage and edits lo file.
• This  will help the HDFS for maintaining consistency wherever it leads to crash.