Hadoop
Hadoop Mastery Quiz
Test your knowledge of Hadoop and HDFS with this engaging quiz! Whether you're a beginner or an experienced practitioner, this quiz will challenge your understanding of key concepts and practices in Hadoop.
Key topics include:
- HDFS architecture
- Data nodes and name nodes
- Replication factors
- Distributed cache
1. When a client contacts the namenode for accessing a file, the namenode responds with which of the following?
Size of the file requested
Block ID and hostname of any one of the data nodes containing that block
Block ID and hostname of all the data nodes containing that block
Block ID of the file requested
3. When a backup node is used in a cluster there is no need of which of the following?
Secondary name node
Rack awareness
Check point node
Secondary data node
4. Which of the following are among the duties of the Data Nodes in HDFS?
None of these options is correct.
Maintain the file system tree and metadata for all files and directories
Store and retrieve blocks when told to by clients or the NameNode.
Control the execution of an individual map task or a reduce task
Manage the file system namespace.
5. The client reading the data from HDFS filesystem in Hadoop does which of the following?
Gets only the block locations form the namenode
Gets both the data and block location from the namenode
Gets the block location from the datanode
Gets the data from the namenode
6. The namenode loses its only copy of fsimage file. We can recover this from which of the following?
Secondary Namenode
Datanodes
It can’t be recovered
Checkpoint node
7. "Under replication" in HDFS means which of the following?
Replication process is very slow in the data nodes.
No replication is happening in the data nodes.
The frequency of replication in data nodes is very low.
The number of replicated copies is less than as specified by the replication factor.
8. The datanode and namenode are, respectiviley, which of the following?
Master and worker nodes
Both are worker nodes
None of these
Worker and Master nodes
9. What is distributed cache?
The distributed cache is special component on data node that will cache frequently used data for faster client response. It is used during map step.
The distributed cache is a component that caches java objects.
The distributed cache is special component on name node that will cache frequently used data for faster client response. It is used during reduce step.
The distributed cache is a component that allows developers to deploy jars for Map-Reduce processing.
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