The failure of which daemon makes HDFS unavailable on a cluster running MapReduce v1 (MRv1)?

The correct answer is E. NameNode. The NameNode is the centerpiece of an HDFS file system. It keeps the directory tree of all files in the file system, and tracks where across the cluster the file data is kept. It does not store the data of these files itself. There is only One NameNode process run on any hadoop…

Solution Evaluation

Question

Options

ANode Manager
BApplication Manager
CResource Manager
DSecondary NameNode
ENameNode
FDataNode

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(36 responses)

C
3% (1)
D
6% (2)
E
83% (30)
F
8% (3)

Explanation

The NameNode is the centerpiece of an HDFS file system. It keeps the directory tree of all files in the file system, and tracks where across the cluster the file data is kept. It does not store the data of these files itself. There is only One NameNode process run on any hadoop cluster. NameNode runs on its own JVM process. In a typical production cluster its run on a separate machine. The NameNode is a Single Point of Failure for the HDFS Cluster. When the NameNode goes down, the file system goes offline. NameNode? How many instances of NameNode run on a Hadoop Cluster?

Topics

#HDFS Availability#NameNode Single Point of Failure#Hadoop Daemons#MRv1 Architecture

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