Which three processes does HDFS High Availability (HA) enable on your cluster?
A.
Automatically ‘fail over’ between NameNodes if one goes down
B.
Write data to two clusters simultaneously
C.
Shut one NameNode down for maintenance without halting the cluster
D.
Manually ‘fail over’ between NameNodes
E.
Configure unlimited hot standby NameNode.
Explanation:
The HDFS High Availability feature addresses the above problems by providing the
option of running two redundant NameNodes in the same cluster in an Active/Passive
configuration with a hot standby. This allows a fast failover to a new NameNode in the case that a
machine crashes, or a graceful administrator-initiated failover for the purpose of planned
maintenance.