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HDFS Exam – Questions With Accurate Solutions
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HDFS Exam – Questions With Accurate Solutions
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HDFS Exam – Questions With Accurate Solutions1. A ________ serves as the master and there is only one NameNode per cluster.
a) Data Node
b) NameNode
c) Data block
d) Replication ✔️Answer: b
Explanation: All the metadata related to HDFS including the information about
data nodes, files stored on HDFS, and Replication, etc. are stored and
maintained on the NameNode.
2. Point out the correct statement :
a) DataNode is the slave/worker node and holds the user data in the form of
Data Blocks
b) Each incoming file is broken into 32 MB by default
c) Data blocks are replicated across different nodes in the cluster to ensure a
low degree of fault tolerance
d) None of the mentioned ✔️Answer: a
Explanation: There can be any number of DataNodes in a Hadoop Cluster.
3. HDFS works in a __________ fashion.
a) master-worker
b) master-slave
c) worker/slave
d) all of the mentioned ✔️Answer: a
Explanation: NameNode servers as the master and each DataNode servers as a
worker/slave
4. ________ NameNode is used when the Primary NameNode goes down.
a) Rack
b) Data
c) Secondary
d) None of the mentioned ✔️Answer: c
Explanation: Secondary namenode is used for all time availability and
reliability.
5. Point out the wrong statement :
, a) Replication Factor can be configured at a cluster level (Default is set to 3)
and also at a file level
b) Block Report from each DataNode contains a list of all the blocks that are
stored on that DataNode
c) User data is stored on the local file system of DataNodes
d) DataNode is aware of the files to which the blocks stored on it belong to
✔️Answer: d
Explanation: NameNode is aware of the files to which the blocks stored on it
belong to.
6. Which of the following scenario may not be a good fit for HDFS ?
a) HDFS is not suitable for scenarios requiring multiple/simultaneous writes
to the same file
b) HDFS is suitable for storing data related to applications requiring low
latency data access
c) HDFS is suitable for storing data related to applications requiring low
latency data access
d) None of the mentioned ✔️Answer: a
Explanation: HDFS can be used for storing archive data since it is cheaper as
HDFS allows storing the data on low cost commodity hardware while ensuring
a high degree of fault-tolerance.
7. The need for data replication can arise in various scenarios like :
a) Replication Factor is changed
b) DataNode goes down
c) Data Blocks get corrupted
d) All of the mentioned ✔️Answer: d
Explanation: Data is replicated across different DataNodes to ensure a high
degree of fault-tolerance.
8. ________ is the slave/worker node and holds the user data in the form of Data
Blocks.
a) DataNode
b) NameNode
c) Data block
d) Replication ✔️Answer: a
Explanation: A DataNode stores data in the [HadoopFileSystem]. A functional
filesystem has more than one DataNode, with data replicated across them.
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