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Hadoop Interview Questions And Answers


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Hadoop Interview Questions and Answers Section 01


1. The block size is set to by default.
a. 64MB
b. 32MB
c. 16MB
d. 128MB


2. Which of the parameters below describes the archive's destination directory?
a.Title of the archive
b. origin
c. place of travel
d. None of the aforementioned options are available.


3. In the Hadoop Ecosystem, is the most popular high-level Java API.
a. HCatalog
b. Cascalog
c. Scalding
d. Cascading is a term that refers to a series of events that occur


4. HDFS files are intended for use with high-density storage systems.
a. Only writing once into a file
b. Data access with a low latency.
c. Modifications at arbitrary offsets and multiple writers.
d. Do not append anything to the file until the end.



5. The names of the parameters are changed during the execution of a streaming task.
a. vmap
b. mapvim
c. Mapreduce
d. Mapred


6. In the Hadoop environment, what does commodity Hardware imply?
a. Hardware that is industry standard
b. Low specs Hardware that is used in the industry
c. Hardware that has been discarded
d. Low-cost hardware


7. Gzip (short for GNU zip) compresses files and gives them the extension.
a. .g
b. .gzp
c. .gzip
d. .gz


8. In a disc balancer, the datanode chooses the disc for the block based on which volume is chosen.
a. It's a round-robin competition.
b. The amount of room available
c. Each and every one of the preceding options
d. None of the aforementioned options are viable options.


9. The option allows you to copy jars to the current working directory of tasks and have them automatically unjarred.
a. Documents
b. mission
c. archives
d. None of the above


10. To offer various outputs to Hadoop, which of the following is used?
a. MultipleOutputs is a class that allows you to have several outputs.
b. DBInputFormat is a type of DBInputFormat that is used to format data
c. FileOutputFormat is a format for the output of a file.
d. MultipleOutputFormat is a type of output format that has more than one output format.


11. ------is a Hadoop Map/Reduce scheduler that allows huge clusters to be shared.
a. A Flow Scheduler is a programme that allows you to schedule the flow
b. Data Scheduler
c. Capacity Scheduler
d. None of the above


12. Enable disk balancer in hdfs-site.xml by setting which of the following to true
a. dfs.balancer.enabled is a value that is set in the dfs.balancer.enabled property.
b. dfs.disk.balancer.disabled i
c. dfs.disk.balancer.enabled
d. diskbalancer.enabled



13. Hadoop is responsible for which of the following genres?
a. The Relational Database Management System (RDBMS) is a type of database management system
b. A file system that is shared across multiple computers.
c. JAX-RS (Java Application XML Representational State Transfer)
d. Java Message Service (JMS) is a service that lets you send and receive messages


14. How many partitioners are there in total?
a. The quantity of reducers
b. The quantity of combiners
c. The amount of mappers
d. None of the above


15. Per terabyte compressed, the compression offset map expands to GB.
a. 1-3
b. 10–16
c. 20-22
d. 0-1


16. Simply mentioning a specific directory isn't enough for Some partitioning jobs.
a. inanimate
b. semi-cluster
c. dynamic
d. All of the above


17. Data written by one system can be sorted efficiently by another system using .
a. Data Type: Complex
b. Establish a hierarchy
c. Order of Sorting
d. Each and every one of the above


18.All SSD Data replication is required in a variety of situations, including the following:
a.The Replication Factor has been modified.
b.The DataNode is no longer available.
c.Corrupted Data Blocks
d. Each and every one of the above


19.Identify the following statement as being incorrect:
a. In Hive, variables have four different namespaces.
b. With the define command, you can create custom variables in a different namespace.
c. Hivevar can also be used to define custom variables in their own namespace.
d. None of the aforementioned options are available.


20. A is a way to extend Ambari by allowing third parties to add additional resource types to the APIs.
a. cause
b. observe
c. model
d. None of the above


21.---- is a free and open source system for data analysis that is expressive, declarative, quick, and efficient.
a. Flume
b. flink
c. Flexibility
d. ESME


22. What programming language did Hadoop use?
a. Java (software platform)
b. Perl
c. Java, version (programming language)
d. Lua (programming language)


23. The function is called by the InputFormat class, which computes splits for each file and delivers them to the jobtracker.
a. says
b. is rewarded
c. getSplits is a command that returns a list of splits.
d. All of the above


24. The can be used to report progress and set application-level status messages in applications.
a. Partitioner
b. OutputSplit
c. Reporter
d. Each and every one of the above


25. A MapReduce job is submitted by your client application to your Hadoop cluster. Identify the Hadoop daemon that the Hadoop framework will use to plan a MapReduce job.
a. JobTracker
b. DataNode
c. JobTracker
d. TaskTracker


26. What should be the top limit for a Map Reduce job's counters?
a. 5
b. 15
c. 150
d. 50


27. PIG data is read using which of the following functions?
a. WRITING
b. READING IN
c. LOADING
d. None of the aforementioned options are available.


28. Traditional Hadoop deployments have a single point of failure, whereas are highly resilient and eliminate that risk.
a. EMR
b. Solutions from Isilon
c. AWS
d. None of the aforementioned options are available.


29. The Mapreduce architecture for Hadoop does not sort the output of the Program.
a. Mapping
b. Cascader
c. Scalding
d. None of the above


30. You'll need a distributed, scalable data store that lets you access hundreds of terabytes of data at random and in real time. Which of the options do you think you'd go with?
a. Hue
b. Pig
c. HBase
d. Flume


Hadoop Interview Questions and Answers Section 02

1. A framework for creating data flows for ETL (extract, transform, and load) processing and analysis of huge datasets has been developed.
a. Oozie
b. HIVE
c. Pig
d. Latin


2. In HDFS, you can use the merge command to combine all the files in a directory.
a. getmerge
b. putmerge
c. reappear
d. mergeall


3. HBase is used for what?
a. Quick Navigation, in Hadoop, reduce layer
b. Hadoop's MapReduce replacement
c. In Hadoop, a tool for doing random and fast read/write operations
d. More quickly In Hadoop, there is a read-only query engine.


4. Which attribute controls whether speculative execution is enabled or disabled?
a. mapred.map.tasks.speculative.execution
b. speculative.execution.mapred.reduce.tasks
c. Both of the preceding
d. None of the preceding


5. What should the namenode's hardware be like?
a. Simply increase the amount of RAM available to each of the data nodes.
b. It makes no difference.
c. Better than the commodity grade
d. Commodity quality


6. Which of the following statements most accurately defines TextInputFormat's operation?
a. Because the input file is divided precisely at line breaks, each Record Reader will read a series of entire lines.
b. Line breaks in the input file might be crossed. The RecordReaders of both splits containing the brokenlin line read a line that crosses file splits.
c. Line breaks in the input file might be crossed. The RecordReader of the file split that contains the beginning of the broken line reads a line that crosses file splits.
d. Line breaks in the input file might be crossed. The RecordReader of the split that contains the end of the broken line is used to read a line that crosses file divides.


7.EXCEPT FOR HADOOP, ALL OF THESE ARE ACCURATE DESCRIPTIONS.
a. Instantaneous
b. A method of computing that is distributed.
c. Java-based system
d. Source code


8. In MapReduce, the input split signifies
a. The average data block size used as programme input.
b. The precise location of the block's first and last full records.
c. Splitting the data input to a MapReduce programme into a size specified in the mapred-site.xml file.
d. None of these are correct.


9. Which of the following is/are an example of Real-Time Big Data Processing?
a. CEP platforms (Complex Event Processing)
b. Data analysis for the stock market
c. Detection of financial fraud transactions
d. (A) and (B) are both true


10. When the active node fails in NameNode HA, which node assumes responsibility for the active node?
a. Node with a secondary name
b. Node that serves as a backup
c. Node of the checkpoint
d. Node in standby


11. On mapred-site.xml, which of the following properties is configured?
a. Factor of replication
b. hdfs file storage directory names
c. The host and port where the MapReduce task is executed
d. Variables in the Java environment.


12. What should the namenode's hardware be like?
a. Simply increase the amount of RAM available to each of the data nodes.
b. It makes no difference.
c. Better than the commodity grade
d. Commodity quality


13. Which of the following statements most accurately defines TextInputFormat's operation?
a. Because the input file is divided precisely at line breaks, each Record Reader will read a series of entire lines.
b. Line breaks in the input file might be crossed. The RecordReaders of both splits containing the brokenlin line read a line that crosses file splits.
c. Line breaks in the input file might be crossed. The RecordReader of the file split that contains the beginning of the broken line reads a line that crosses file splits.
d. Line breaks in the input file might be crossed. The RecordReader of the split that contains the end of the broken line is used to read a line that crosses file divides.


14. EXCEPT FOR HADOOP, ALL OF THESE ARE ACCURATE DESCRIPTIONS.
a. Instantaneous
b. A method of computing that is distributed.br /> c. Java-based system
d. Source code


15. In MapReduce, the input split signifies
a. The average data block size used as programme input.
b. The precise location of the block's first and last full records.
c. Splitting the data input to a MapReduce programme into a size specified in the mapred-site.xml file.
d. None of these are correct.


16. Which of the following is/are an example of Real-Time Big Data Processing?
a. CEP platforms (Complex Event Processing)
b. Data analysis for the stock market
c. Detection of financial fraud transactions
d.(A) and (B) are both true


17. When the active node fails in NameNode HA, which node assumes the active node's responsibility?
a. NameNode (secondary)
b. Node
c. Node of the checkpoint
d. The node that serves as a backup


18. What is Hadoop's origin?
a.A favourite circus act of creator Doug Cuttings
b.Cuttings' son's toy elephant
c. Cuttings, a rock band from high school
d. A Hadoop's development laptop with sound cuttings


19. What Hadoop methods are used to keep the name node from failing?
a. Back up the metadata of the filesystem to a local drive and a remote NFS mount.
b. Cloud-store the metadata from the filesystem.
c. Make sure you have at least 12 CPUs on your PC.
d. Investing in high-quality, long-lasting equipment.


20. Big Data was coined by:
a. Domain of Stock Exchanges
b. Domains of Genomics and Astronomy
c. Domain of the Social Media
d. Domain of Banking and Finance


21. Which of the following statements concerning NameNode High Availability is correct?
a. Identify and eliminate a single point of failure.
b. In order to achieve a high degree of scalability
c. Cut your storage costs in half.
d. None of the aforementioned options are viable options.


22. HDFS federation is a system that allows users to share files across several servers.
a. The metadata for the entire filesystem is managed by each name node.
b. A piece of the filesystem's metadata is managed by each name node.
c. If a single name node fails, the entire filesystem loses access to some metadata.
d. Each data node establishes a connection to each name node.


23. What is a SequenceFile, and what is it used for?
a. A Flow Diagram
b. An arbitrary number of homogenous readable objects are encoded in binary in a file.
c. A SequenceFile is a binary encoding of an arbitrary number of WritableComparable objects, sorted in order.
d. A Sequence is a term used to describe a series of events


24. Hadoop is a framework that integrates with a number of other programmes. Is it true that there are common cohorts?
a. MapReduce, Hive, and HBase are three of the most popular data processing frameworks.
b. MapReduce, MySQL, and Google Apps are three of the most popular technologies.
c. Iguana, Hummer, and MapReduce
d. Heron, Trumpet, and MapReduce


25. Hadoop's data locality feature entails
a. Use many nodes to store the same data.
b. Transfer data from one node to the next.
c. Store the data in the same location as the compute nodes.
d. Distribute the data over a number of different nodes.


26. In the Hadoop environment, what does commodity hardware imply?
a. Low-cost equipment.
b. Hardware that is common in the industry.
c. Hardware that has been discarded
d. Minimal requirements Hardware that is fit for a business


27.Which of the following options addresses the problem of small files?
a. Hadoop archives, for example
b. Files that include sequences
c. HBase
d. Each and every one of the preceding options


28. What happens if an HDFS block becomes unavailable due to disc corruption or machine failure in a Hadoop cluster?
a. It is irretrievably lost.
b. It can be copied to other live devices from its alternate places.
c. The name node permits new client requests to attempt to read it in the future.
d.The MapReduce task process skips over the block and its contents.


29. On mapred-site.xml, which of the following properties is set?
a. Factor of reproduction
b. hdfs file directory names
c. The host and port on which the MapReduce task is executed.
d. VARIABLES IN THE Java ENVIRONMENT


30. Is a map input format available?
a. Yes, but only in Hadoop 0.22 and above.
b. Map files do have their own format.
c. No, however map files can be read via the sequence file input format.
d. A and B are both true.





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