MCQs on Setting Up Hadoop Environment | Hadoop HDFS
Explore the essential steps for setting up Hadoop, from installing Hadoop to configuring a single-node cluster, and setting up a multi-node Hadoop cluster. Understand key HDFS configuration files in this detailed guide.
MCQs on Setting Up Hadoop Environment
Section 1: Installing Hadoop (10 Questions)
- What is the first step in installing Hadoop?
- a) Installing the necessary Java version
- b) Downloading the Hadoop binaries
- c) Setting up HDFS
- d) Configuring the Hadoop environment variables
- Which version of Java is recommended for installing Hadoop?
- a) Java 8
- b) Java 7
- c) Java 11
- d) Java 9
- To install Hadoop on a machine, which operating system is most commonly used?
- a) Ubuntu
- b) Windows
- c) CentOS
- d) MacOS
- Which Hadoop component needs to be installed first when setting up Hadoop?
- a) Hadoop HDFS
- b) Hadoop MapReduce
- c) Hadoop YARN
- d) Hadoop Common
- How can you verify that Hadoop is installed correctly on a system?
- a) By running
hadoop versioncommand - b) By checking system logs
- c) By verifying the Java version
- d) By inspecting the system memory usage
- a) By running
- Which command is used to start Hadoop after installation?
- a)
start-all.sh - b)
hadoop start - c)
start-hadoop.sh - d)
hadoop start-all
- a)
- After installing Hadoop, what must be done to configure the environment?
- a) Set the JAVA_HOME variable
- b) Set the Hadoop_HOME variable
- c) Set both JAVA_HOME and Hadoop_HOME
- d) Set the HDFS_HOME variable
- Where should you place the Hadoop binaries after downloading them?
- a) In the
/usr/local/hadoop/directory - b) In the
/bin/hadoop/directory - c) In the
/home/hadoop/directory - d) In the
/opt/directory
- a) In the
- How do you ensure Hadoop is able to communicate with other systems in a cluster?
- a) By configuring SSH between the master and slave nodes
- b) By configuring the DNS settings
- c) By opening necessary ports on the firewall
- d) By modifying system configurations in Hadoop
- What is the default Hadoop version used in most installations?
- a) 2.x
- b) 3.x
- c) 1.x
- d) 4.x
Section 2: Configuring Hadoop on Single Node Cluster (10 Questions)
- What is a single-node Hadoop cluster?
- a) A Hadoop cluster with all components running on a single machine
- b) A Hadoop cluster with multiple machines but only one active node
- c) A cluster with a single machine running MapReduce jobs
- d) A single-node setup for distributed file storage
- Which configuration file is primarily modified for a single-node Hadoop cluster setup?
- a)
core-site.xml - b)
hdfs-site.xml - c)
mapred-site.xml - d)
yarn-site.xml
- What is the purpose of the core-site.xml file in a single-node Hadoop cluster?
- a) It defines the default file system and URI
- b) It configures the memory allocation for MapReduce jobs
- c) It defines the YARN settings
- d) It configures the user’s home directory
- In the single-node Hadoop cluster, what service is responsible for managing resources?
- a) ResourceManager
- b) JobTracker
- c) DataNode
- d) NameNode
- In a single-node cluster, which command is used to format the HDFS?
- a)
hdfs namenode -format - b)
hadoop fs -format - c)
yarn namenode -format - d)
format hadoop
- What port does the NameNode typically run on in a single-node Hadoop cluster?
- a) 50070
- b) 8088
- c) 9000
- d) 8042
- What does the DataNode do in a single-node Hadoop cluster?
- a) Stores the actual data and performs block operations
- b) Manages resource allocation
- c) Coordinates MapReduce jobs
- d) Handles job scheduling and monitoring
- What is the main purpose of YARN in a single-node Hadoop cluster?
- a) To manage resources and scheduling of MapReduce jobs
- b) To manage HDFS block replication
- c) To store large datasets
- d) To configure the Hadoop network
- What should be the value of the fs.defaultFS property in a single-node Hadoop cluster?
- a)
hdfs://localhost:9000 - b)
hdfs://localhost - c)
file:/// - d)
hdfs://127.0.0.1
- What is the default replication factor for HDFS in a single-node Hadoop cluster?
- a) 1
- b) 3
- c) 2
- d) 4
Section 3: Setting Up Multi-node Hadoop Cluster (5 Questions)
- What is a multi-node Hadoop cluster?
- a) A cluster where Hadoop components are distributed across multiple machines
- b) A single-machine setup where Hadoop simulates multiple nodes
- c) A cluster that runs only on cloud platforms
- d) A cluster with only one master node
- Which file must be configured to specify slave nodes in a multi-node Hadoop cluster?
- a)
slaves - b)
core-site.xml - c)
hdfs-site.xml - d)
mapred-site.xml
- How do you set up NameNode in a multi-node cluster?
- a) Specify the master node’s address in the
core-site.xmlfile - b) Set up the NameNode on each slave node
- c) Use the
yarn-site.xmlfile to configure the NameNode - d) NameNode cannot be configured in a multi-node cluster
- How is HDFS replicated across multiple nodes in a multi-node Hadoop cluster?
- a) By setting the replication factor in the
hdfs-site.xmlfile - b) By configuring the
yarn-site.xmlfile - c) By setting the replication factor in the
core-site.xmlfile - d) By using external replication tools
- Which service is responsible for resource management in a multi-node Hadoop cluster?
- a) YARN ResourceManager
- b) MapReduce JobTracker
- c) NameNode
- d) HDFS DataNode
Section 4: Introduction to Hadoop Distributed File System (HDFS) Configuration Files (5 Questions)
- What is the primary purpose of HDFS in a Hadoop environment?
- a) To store large datasets in a distributed manner across multiple nodes
- b) To execute MapReduce jobs
- c) To manage job scheduling
- d) To configure resource allocation
- Which HDFS configuration file defines the directory locations for HDFS data?
- a)
hdfs-site.xml - b)
core-site.xml - c)
mapred-site.xml - d)
yarn-site.xml
- What should be specified in the dfs.namenode.name.dir property of the
hdfs-site.xmlfile?
- a) The directory path for storing the NameNode data
- b) The directory path for storing the DataNode data
- c) The directory path for storing temporary files
- d) The directory path for logs
- What is the function of the dfs.replication property in the
hdfs-site.xmlfile?
- a) It specifies the replication factor for HDFS blocks
- b) It sets the block size in HDFS
- c) It defines the HDFS directory for temporary files
- d) It configures the network bandwidth for HDFS
- What should the dfs.datanode.data.dir property in the
hdfs-site.xmlfile define?
- a) The directory for storing DataNode data
- b) The directory for storing NameNode metadata
- c) The directory for storing MapReduce logs
- d) The directory for storing system logs
Answers Table
| Qno | Answer (Option with the text) |
|---|---|
| 1 | a) Installing the necessary Java version |
| 2 | a) Java 8 |
| 3 | a) Ubuntu |
| 4 | d) Hadoop Common |
| 5 | a) By running hadoop version command |
| 6 | a) start-all.sh |
| 7 | c) Set both JAVA_HOME and Hadoop_HOME |
| 8 | a) In the /usr/local/hadoop/ directory |
| 9 | a) By configuring SSH between the master and slave nodes |
| 10 | a) 2.x |
| 11 | a) A Hadoop cluster with all components running on a single machine |
| 12 | a) core-site.xml |
| 13 | a) It defines the default file system and URI |
| 14 | a) ResourceManager |
| 15 | a) hdfs namenode -format |
| 16 | a) 50070 |
| 17 | a) Stores the actual data and performs block operations |
| 18 | a) To manage resources and scheduling of MapReduce jobs |
| 19 | a) hdfs://localhost:9000 |
| 20 | a) 1 |
| 21 | a) A cluster where Hadoop components are distributed across multiple machines |
| 22 | a) slaves |
| 23 | a) Specify the master node’s address in the core-site.xml file |
| 24 | a) By setting the replication factor in the hdfs-site.xml file |
| 25 | a) YARN ResourceManager |
| 26 | a) To store large datasets in a distributed manner across multiple nodes |
| 27 | a) hdfs-site.xml |
| 28 | a) The directory path for storing the NameNode data |
| 29 | a) It specifies the replication factor for HDFS blocks |
| 30 | a) The directory for storing DataNode data |