Under Hadoop High Availability, Fencing means
a)Preventing a previously active namenode from start running again.
b)Preventing the start of a failover in the event of network failure with the
active namenode.
c)Preventing the power down to the previously active namenode.
d)Preventing a previously active namenode from writing to the edit log.
a)Preventing a previously active namenode from start running again.
b)Preventing the start of a failover in the event of network failure with the
active namenode.
c)Preventing the power down to the previously active namenode.
d)Preventing a previously active namenode from writing to the edit log.