Cloudera

CCD-333 · Question #47

How does the NameNode detect that a DataNode has failed?

The correct answer is B. When the NameNode fails to receive periodic heartbeats from the DataNode, it considers the. See the full explanation below for the reasoning.

Question

How does the NameNode detect that a DataNode has failed?

Options

AThe NameNode does not need to know that a DataNode has failed.
BWhen the NameNode fails to receive periodic heartbeats from the DataNode, it considers the
CThe NameNode periodically pings the datanode. If the DataNode does not respond, the
DWhen HDFS starts up, the NameNode tries to communicate with the DataNode and considers

How the community answered

(40 responses)

A
3% (1)
B
78% (31)
C
8% (3)
D
13% (5)

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Full CCD-333 Practice