Infosys Certified Big Data Developer
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Join Premium10 Infosys Certified Big Data Developer practice questions with answers
Real Lex exam-pattern multiple-choice questions for the Infosys Certified Big Data Developer certification. Each question includes the correct answer. The full question bank is available to Premium members.
- Question 1
Which of the following statement(s) is/are true about YARN ?
(i) A YARN application can make resource requests at any time while it is running.
(ii) To run an application on YARN, a client will first contact the resource manager
(iii) Scalability is the major issue with YARN architecture- ✓ (i) and (ii) Correct
- B only (ii)
- C only (iii)
- D only (i)
- Question 2
Which of the following statement(s) is/are true about HDFS ?
(i) Keeping the HDFS block size large reduces the disk seek time
(ii) HDFS files are immutable
(iii) The NameNode stores block locations in EditLog- ✓ only (i) and (ii) Correct
- B Only ( i) and (iii)
- C only (iii)
- D all the given statements are true
- Question 3
A and B are working on a file available in HDFS. A opens the file and started making changes while B also started making changes on the same file concurrently.
What is true about the above use case ?
(i) A and B can read the same file simultaneously
(ii) This is an impossible use case considering HDFS features
(iii) A can read the file while B is modifying the same file in HDFS- ✓ both (i) and (ii) Correct
- B only (i)
- C both (ii) and (iii)
- D All the given statements are true
- Question 4
Which of the following statement(s) is/are correct, if a datanode fails,
a. Namenode will stop redirecting I/O request to the failed node
b. Blocks are auto replicated to satisfy the replication factor
c. Namenode will wait untill the datanode is up and running
- ✓ Only a Correct
- B Only c
- C Only a and b
- D All the given statements are correct
- Question 5
Consider a scenario where a client is reading a big data file from HDFS. Which of the following denotes the correct sequence of this read operation?
- ✓ The client queries the NameNode for the block location(s). The NameNode returns the block location(s) to the client. The client reads the data directly off the DataNode(s). Correct
- B The client queries all DataNodes in parallel. The DataNode that contains the requested data responds directly to the client. The client reads the data directly off the DataNode.
- C
The client contacts the NameNode for the block location(s). The NameNode then queries the DataNodes for block locations. The NameNode reads data from the DataNodes and passes it to the client.
- D The client contacts the NameNode for the block location(s). The NameNode contacts the DataNode that holds the requested data block. Data is transferred from the DataNode to the NameNode, and then from the NameNode to the client.
- Question 6
Which of the following are the scheduling policies available in YARN:
(i) FIFO scheduler
(ii) Capacity scheduler
(iii) Fair scheduler- ✓ Only (i) and (ii) Correct
- B Only (i) and (iii)
- C Only (ii) and (iii)
- D (i), (ii) and (iii)
- Question 7
How is data stored in a Hadoop cluster?
(i) The data is divided into blocks, and copies of these blocks are replicated across multiple nodes in the Hadoop cluster.
(ii) The data is converted into a single block, and the block is stored in just one of the nodes in the Hadoop cluster.
(iii) The data is divided into blocks, each block is stored in a different node in the Hadoop cluster, but the blocks are not replicated.
(iv) The data is converted into a single block, and copies of this block are replicated across multiple nodes in the Hadoop cluster.- ✓ only (i) Correct
- B only (ii)
- C only (iii)
- D
only (iv)
- Question 8
Which of the following statement(s) is/are true about file writes in HDFS ?
(i) Namenode receives the request from the client for storing the first block of the file into HDFS
(ii) Datanodes do the replication based on the replication factor
(iii) Namenode is responsible for creating the blocks- ✓ (i) and (ii) Correct
- B (i) and (iii)
- C (ii) and (iii)
- D All the given statements are true
- Question 9
Hadoop cluster was configured with 64 MB block size and some files were stored in it. Later on admin changed the block size to 128 MB. Choose the relevant statements in connection with this situation.
- ✓ Previously stored files have 64 MB block size and newly stored files will have 128 MB block size Correct
- B Previously stored files have 64 MB block size and newly stored files also will have 64 MB block size
- C Previously stored files will be restructured into 128 MB block size and newly stored files also will have 128 MB block size
- D Changing the block size results in inefficient storage and processing of data
- Question 10
Which of the following is/are true ?
(i) Yarn resource allocation can be evenly distributed by creating
queues
(ii) Yarn High Availability automatic failover is taken care by Zookeeper
(iii) All the changes to HDFS are tracked in Edit Logs.
(iv) Name node configured storage will also be used for storing HDFS files data- ✓ (i) and (iii) Correct
- B (i) ,(ii) and (iv)
- C (i) , (ii) and (iii)
- D All of the given statements
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