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LinkedIn: Hadoop | Skill Assessment Quiz Solutions

Hadoop | LinkedIn Skill Assessment Quiz Solutions



  1. Partitioner controls the partitioning of what data?

    • final keys
    • final values
    • intermediate keys
    • intermediate values


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

    • UNION DISTINCT, RANK
    • OVER, RANK
    • OVER, EXCEPT
    • UNION DISTINCT, RANK




  1. 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.
    • 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.


  1. 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
    • signed HTTP


  1. MapReduce jobs can be written in which language?

    • Java or Python
    • SQL only
    • SQL or Java
    • Python or SQL




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

    • Reducer
    • Combiner
    • Mapper
    • Counter


  1. To verify job status, look for the value ____ in the ____.

    • SUCCEEDED; syslog
    • SUCCEEDED; stdout
    • DONE; syslog
    • DONE; stdout




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

    • 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){…}


  1. 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
    • TaskCounter (NOT SURE)


  1. Hadoop Core supports which CAP capabilities?

    • A, P
    • C, A
    • C, P
    • C, A, P




  1. What are the primary phases of a Reducer?

    • combine, map, and reduce
    • shuffle, sort, and reduce
    • reduce, sort, and combine
    • map, sort, and combine


  1. 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
    • Zookeeper; open source




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

    • data
    • name
    • memory
    • worker


  1. DataNode supports which type of drives?

    • hot swappable
    • cold swappable
    • warm swappable
    • non-swappable


  1. 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
    • in memory of all workers




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

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


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

    • distributed cache
    • local cache
    • partitioned cache
    • cluster cache




  1. 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
    • map inputs


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