BD UNIT-IV

Which command is used to check the health status of an HDFS cluster?

• hdfs dfsadmin -report

• hadoop fsck /

• hadoop job -list

• mapred job -status

Which of the following is used to manage Hadoop cluster access control?

• Kerberos authentication

• Hadoop balancer

• HDFS Secondary NameNode

• MapReduce framework

Which of the following commands is used to start the Hadoop Distributed File System (HDFS)?

• hadoop namenode -format

• start-dfs.sh

• hdfs namenode

• hadoop fs -ls

What is the purpose of the HDFS NameNode?

• To execute MapReduce jobs

• To perform data replication

• To manage metadata and namespace

• To store data blocks

Which command is used to copy files from the local file system to HDFS?

• hdfs dfs -moveToLocal

• hadoop fs -copy

• hdfs copyFromLocal

• hadoop fs -put

What is the function of the HDFS DataNode?

• To manage the file system namespace

• To store actual data blocks

• To handle client requests

• To perform data compression

Which file is used to configure Hadoop cluster properties?

• core-site.xml

• mapred-site.xml

• hdfs-site.xml

• All of the above

Which of the following is NOT a characteristic of a graph?

• Graph consists of nodes and edges

• Graph edges can be directed or undirected

• Graphs always have an equal number of edges and nodes

• Graphs can have weighted or unweighted edges

Which of the following algorithms is NOT used for finding the shortest path in a graph?

• Dijkstra’s Algorithm

• Breadth-First Search (BFS)

• Bellman-Ford Algorithm

• Prim’s Algorithm

What is the primary role of the ResourceManager in a Hadoop cluster?

• To manage the HDFS storage

• To schedule and allocate resources for applications

• To monitor the health of DataNodes

• To execute MapReduce tasks