Which three processes does HDFS High Availability (HA) enable on your cluster?

The correct answer is A. Automatically 'fail over' between NameNodes if one goes down C. Shut one NameNode down for maintenance without halting the cluster D. Manually 'fail over' between NameNodes. 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…

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Question

Options

AAutomatically 'fail over' between NameNodes if one goes down
BWrite data to two clusters simultaneously
CShut one NameNode down for maintenance without halting the cluster
DManually 'fail over' between NameNodes
EConfigure unlimited hot standby NameNode.

How the community answered

(35 responses)

A
74% (26)
B
17% (6)
E
9% (3)

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.

Topics

#HDFS HA#NameNode failover#standby NameNode#cluster availability

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