Hadoop LinkedIn assessment answers 2023

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Hadoop LinkedIn assessment Details:

• 15 – 20 multiple-choice questions
• 1.5 minutes per question
• Score in the top 30% to earn a badge

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Hadoop LinkedIn assessment answers

Q1. Partitioner controls the partitioning of what data?

• [ ] final keys
• [ ] final values
• [x] intermediate keys
• [ ] intermediate values

Q2. SQL Windowing functions are implemented in Hive using which keywords?

• [ ] UNION DISTINCT, RANK
• [x] OVER, RANK
• [ ] OVER, EXCEPT
• [ ] UNION DISTINCT, RANK

Q3. Rather than adding a Secondary Sort to a slow Reduce job, it is Hadoop best practice to perform which optimization?

• [ ] Add a partitioned shuffle to the Map job.
• [x] Add a partitioned shuffle to the Reduce job.
• [ ] Break the Reduce job into multiple, chained Reduce jobs.
• [ ] Break the Reduce job into multiple, chained Map jobs.

Q4. Hadoop Auth enforces authentication on protected resources. Once authentication has been established, it sets what type of authenticating cookie?

• [ ] encrypted HTTP
• [ ] unsigned HTTP
• [ ] compressed HTTP
• [x] signed HTTP

Q5. MapReduce jobs can be written in which language?

• [x] Java or Python
• [ ] SQL only
• [ ] SQL or Java
• [ ] Python or SQL

Q6. To perform local aggregation of the intermediate outputs, MapReduce users can optionally specify which object?

• [ ] Reducer
• [x] Combiner
• [ ] Mapper
• [ ] Counter

Q7. To verify job status, look for the value ___ in the ___.

• [ ] SUCCEEDED; syslog
• [x] SUCCEEDED; stdout
• [ ] DONE; syslog
• [ ] DONE; stdout

Q8. Which line of code implements a Reducer method in MapReduce 2.0?

• [x] public void reduce(Text key, Iterator values, Context context){…}
• [ ] public static void reduce(Text key, IntWritable[] values, Context context){…}
• [ ] public static void reduce(Text key, Iterator values, Context context){…}
• [ ] public void reduce(Text key, IntWritable[] values, Context context){…}

Q9. To get the total number of mapped input records in a map job task, you should review the value of which counter?

• [ ] FileInputFormatCounter
• [ ] FileSystemCounter
• [ ] JobCounter
• [x] TaskCounter (NOT SURE)

Q10. Hadoop Core supports which CAP capabilities?

• [x] A, P
• [ ] C, A
• [ ] C, P
• [ ] C, A, P

Q11. What are the primary phases of a Reducer?

• [ ] combine, map, and reduce
• [x] shuffle, sort, and reduce
• [ ] reduce, sort, and combine
• [ ] map, sort, and combine

Q12. To set up Hadoop workflow with synchronization of data between jobs that process tasks both on disk and in memory, use the ___ service, which is ___.

• [ ] Oozie; open source
• [ ] Oozie; commercial software
• [ ] Zookeeper; commercial software
• [x] Zookeeper; open source

Q13. For high availability, use multiple nodes of which type?

• [ ] data
• [x] name
• [ ] memory
• [ ] worker

Q14. DataNode supports which type of drives?

• [x] hot swappable
• [ ] cold swappable
• [ ] warm swappable
• [ ] non-swappable

Q15. Which method is used to implement Spark jobs?

• [ ] on disk of all workers
• [ ] on disk of the master node
• [ ] in memory of the master node
• [x] in memory of all workers

Q16. In a MapReduce job, where does the map() function run?

• [ ] on the reducer nodes of the cluster
• [x] on the data nodes of the cluster (NOT SURE)
• [ ] on the master node of the cluster
• [ ] on every node of the cluster

Q17. To reference a master file for lookups during Mapping, what type of cache should be used?

• [x] distributed cache
• [ ] local cache
• [ ] partitioned cache
• [ ] cluster cache

Q18. Skip bad records provides an option where a certain set of bad input records can be skipped when processing what type of data?

• [ ] cache inputs
• [ ] reducer inputs
• [ ] intermediate values
• [x] map inputs

Q19. Which command imports data to Hadoop from a MySQL database?

• [ ] spark import –connect jdbc:mysql://mysql.example.com/spark –username spark –warehouse-dir user/hue/oozie/deployments/spark
• [ ] sqoop import –connect jdbc:mysql://mysql.example.com/sqoop –username sqoop –warehouse-dir user/hue/oozie/deployments/sqoop
• [x] sqoop import –connect jdbc:mysql://mysql.example.com/sqoop –username sqoop –password sqoop –warehouse-dir user/hue/oozie/deployments/sqoop
• [ ] spark import –connect jdbc:mysql://mysql.example.com/spark –username spark –password spark –warehouse-dir user/hue/oozie/deployments/spark

Q20. In what form is Reducer output presented?

• [x] compressed (NOT SURE)
• [ ] sorted
• [ ] not sorted
• [ ] encrypted

Q21. Which library should be used to unit test MapReduce code?

• [ ] JUnit
• [ ] XUnit
• [x] MRUnit
• [ ] HadoopUnit

Q22. If you started the NameNode, then which kind of user must you be?

• [ ] hadoop-user
• [x] super-user
• [ ] node-user
• [ ] admin-user

Q23. State _ between the JVMs in a MapReduce job

• [ ] can be configured to be shared
• [ ] is partially shared
• [ ] is shared
• [x] is not shared (https://www.lynda.com/Hadoop-tutorials/Understanding-Java-virtual-machines-JVMs/191942/369545-4.html)

Q24. To create a MapReduce job, what should be coded first?

• [ ] a static job() method
• [x] a Job class and instance (NOT SURE)
• [ ] a job() method
• [ ] a static Job class

Q25. To connect Hadoop to AWS S3, which client should you use?

• [x] S3A
• [ ] S3N
• [ ] S3
• [ ] the EMR S3

Q26. HBase works with which type of schema enforcement?

• [ ] schema on write
• [ ] no schema
• [ ] external schema
• [x] schema on read

Q27. HDFS file are of what type?

• [ ] read-write
• [ ] read-only
• [ ] write-only
• [x] append-only

Q28. A distributed cache file path can originate from what location?

• [ ] hdfs or top
• [ ] http
• [x] hdfs or http
• [ ] hdfs

Q29. Which library should you use to perform ETL-type MapReduce jobs?

• [ ] Hive
• [x] Pig
• [ ] Impala
• [ ] Mahout

Q30. What is the output of the Reducer?

• [ ] a relational table
• [ ] an update to the input file
• [ ] a single, combined list
• [x] a set of pairs

map function processes a certain key-value pair and emits a certain number of key-value pairs and the Reduce function processes values grouped by the same key and emits another set of key-value pairs as output.

Q31. To optimize a Mapper, what should you perform first?

• [ ] Override the default Partitioner.
• [ ] Skip bad records.
• [ ] Break up Mappers that do more than one task into multiple Mappers.
• [ ] Combine Mappers that do one task into large Mappers.

Q32. When implemented on a public cloud, with what does Hadoop processing interact?

• [x] files in object storage
• [ ] graph data in graph databases
• [ ] relational data in managed RDBMS systems
• [ ] JSON data in NoSQL databases

Q33. In the Hadoop system, what administrative mode is used for maintenance?

• [ ] data mode
• [x] safe mode
• [ ] single-user mode
• [ ] pseudo-distributed mode

Q34. In what format does RecordWriter write an output file?

• [x] pairs
• [ ] keys
• [ ] values
• [ ] pairs

Q35. To what does the Mapper map input key/value pairs?

• [ ] an average of keys for values
• [ ] a sum of keys for values
• [x] a set of intermediate key/value pairs
• [ ] a set of final key/value pairs

Q36. Which Hive query returns the first 1,000 values?

• [ ] SELECT…WHERE value = 1000
• [x] SELECT … LIMIT 1000
• [ ] SELECT TOP 1000 …
• [ ] SELECT MAX 1000…

Q37. To implement high availability, how many instances of the master node should you configure?

• [ ] one
• [ ] zero
• [ ] shared
• [x] two or more (https://data-flair.training/blogs/hadoop-high-availability-tutorial)

Q38. Hadoop 2.x and later implement which service as the resource coordinator?

• [ ] kubernetes
• [ ] JobManager
• [ ] JobTracker
• [x] YARN

Q39. In MapReduce, _ have _

• [ ] tasks; jobs
• [ ] jobs; activities
• [x] jobs; tasks
• [ ] activities; tasks

Q40. What type of software is Hadoop Common?

• [ ] database
• [x] distributed computing framework
• [ ] operating system
• [ ] productivity tool

Q41. If no reduction is desired, you should set the numbers of _ tasks to zero

• [ ] combiner
• [x] reduce
• [ ] mapper
• [ ] intermediate

Q42. MapReduce applications use which of these classes to report their statistics?

• [ ] mapper
• [ ] reducer
• [ ] combiner
• [x] counter

Q43. _ is the query language, and _ is storage for NoSQL on Hadoop

• [ ] HDFS; HQL
• [x] HQL; HBase
• [ ] HDFS; SQL
• [ ] SQL; HBase

Q44. MapReduce 1.0 _ YARN

• [x] does not include
• [ ] is the same thing as
• [ ] includes
• [ ] replaces

Q45. Which type of Hadoop node executes file system namespace operations like opening, closing, and renaming files and directories?

• [ ] ControllerNode
• [ ] DataNode
• [ ] MetadataNode
• [x] NameNode

Q46. HQL queries produce which job types?

• [ ] Impala
• [ ] MapReduce
• [ ] Spark
• [ ] Pig

Q47. Suppose you are trying to finish a Pig script that converts text in the input string to uppercase. What code is needed on line 2 below?

1 data = LOAD '/user/hue/pig/examples/data/midsummer.txt'...
2

• [ ] as (text:CHAR[]); upper_case = FOREACH data GENERATE org.apache.pig.piggybank.evaluation.string.UPPER(TEXT);
• [x] as (text:CHARARRAY); upper_case = FOREACH data GENERATE org.apache.pig.piggybank.evaluation.string.UPPER(TEXT);
• [ ] as (text:CHAR[]); upper_case = FOREACH data org.apache.pig.piggybank.evaluation.string.UPPER(TEXT);
• [ ] as (text:CHARARRAY); upper_case = FOREACH data org.apache.pig.piggybank.evaluation.string.UPPER(TEXT);

Q48. In a MapReduce job, which phase runs after the Map phase completes?

• [x] Combiner
• [ ] Reducer
• [ ] Map2
• [ ] Shuffle and Sort

Q49. Where would you configure the size of a block in a Hadoop environment?

• [x] dfs.block.size in hdfs-site.xmls
• [ ] orc.write.variable.length.blocks in hive-default.xml
• [ ] mapreduce.job.ubertask.maxbytes in mapred-site.xml
• [ ] hdfs.block.size in hdfs-site.xml

Q50. Hadoop systems are _ RDBMS systems.

• [ ] replacements for
• [ ] not used with
• [ ] substitutes for
• [x] additions for

Q51. Which object can be used to distribute jars or libraries for use in MapReduce tasks?

• [x] distributed cache
• [ ] library manager
• [ ] lookup store
• [ ] registry

Q52. To view the execution details of an Impala query plan, which function would you use ?

• [x] explain
• [ ] query action
• [ ] detail
• [ ] query plan

Q53. Which feature is used to roll back a corrupted HDFS instance to a previously known good point in time?

• [ ] partitioning
• [x] snapshot
• [ ] replication
• [ ] high availability

Reference

Q54. Hadoop Common is written in which language?

• [ ] C++
• [ ] C
• [ ] Haskell
• [x] Java

Q55. Which file system does Hadoop use for storage?

• [ ] NAS
• [ ] FAT
• [x] HDFS
• [ ] NFS

Q56. What kind of storage and processing does Hadoop support?

• [ ] encrypted
• [ ] verified
• [x] distributed
• [ ] remote

Q57. Hadoop Common consists of which components?

• [ ] Spark and YARN
• [x] HDFS and MapReduce
• [ ] HDFS and S3
• [ ] Spark and MapReduce

Q58. Most Apache Hadoop committers’ work is done at which commercial company?

• [ ] Cloudera
• [ ] Microsoft
• [ ] Google
• [x] Amazon

Q59. To get information about Reducer job runs, which object should be added?

• [] Reporter
• [ ] IntReadable
• [ ] IntWritable
• [ ] Writer

Q60. After changing the default block size and restarting the cluster, to which data does the new size apply?

• [ ] all data
• [ ] no data
• [ ] existing data
• [ ] new data

Q61. Which statement should you add to improve the performance of the following query?

SELECT
  c.id,
  c.name,
  c.email_preferences.categories.surveys
FROM customers c;

• [ ] GROUP BY
• [ ] FILTER
• [ ] SUB-SELECT
• [ ] SORT

Q62. What custom object should you implement to reduce IO in MapReduce?

• [ ] Comparator
• [ ] Mapper
• [x] Combiner
• [ ] Reducer

Q63. You can optimize Hive queries using which method?

• [ ] secondary indices
• [ ] summary statistics
• [ ] column-based statistics
• [ ] a primary key index

Q64. If you are processing a single action on each input, what type of job should you create?

• [ ] partition-only
• [x] map-only
• [ ] reduce-only
• [ ] combine-only

Q65. The simplest possible MapReduce job optimization is to perform which of these actions?

• [ ] Add more master nodes.
• [x] Implement optimized InputSplits.
• [ ] Add more DataNodes.
• [ ] Implement a custom Mapper.

Q66. When you implement a custom Writable, you must also define which of these object?

• [ ] a sort policy
• [ ] a combiner policy
• [ ] a compression policy
• [ ] a filter policy

Q67. To copy a file into the Hadoop file system, what command should you use?

• [ ] hadoop fs -copy
• [ ] hadoop fs -copy
• [x] hadoop fs -copyFromLocal
• [ ] hadoop fs -copyFromLocal

Q68. Delete a Hive _ table and you will delete the table _.

• [ ] managed; metadata
• [ ] external; data and metadata
• [ ] external; metadata
• [x] managed; data

Q69. To see how Hive executed a JOIN operation, use the _ statement and look for the _ value.

• [ ] EXPLAIN; JOIN Operator
• [ ] QUERY; MAP JOIN Operator
• [ ] EXPLAIN; MAP JOIN Operator
• [ ] QUERY; JOIN Operator

Q70. Pig operates in mainly how many nodes?

• [x] Two
• [ ] Three
• [ ] Four
• [ ] Five

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