Introduction to HDFS
Posted by Superadmin on December 09 2015 16:19:19

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1. A ________ serves as the master and there is only one NameNode per cluster.
a) Data Node
b) NameNode
c) Data block
d) Replication


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


3. HDFS works in a __________ fashion.
a) master-worker
b) master-slave
c) worker/slave.
d) All of the mentioned


4. ________ NameNode is used when the Primary NameNode goes down.
a) Rack
b) Data
c) Secondary
d) None of the mentioned




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


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


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


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


9. HDFS provides a command line interface called __________ used to interact with HDFS.
a) “HDFS Shell”
b) “FS Shell”
c) “DFS Shell”
d) None of the mentioned



10. HDFS is implemented in _____________ programming language.
a) C++
b) Java
c) Scala
d) None of the mentioned