Hadoop Quiz 1 | Englishfreetest.com

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    Question 1: The client reading the data from HDFS filesystem in Hadoop does which of the following?
    A. Gets only the block locations form the namenode
    B. Gets the data from the namenode
    C. Gets both the data and block location from the namenode
    D. Gets the block location from the datanode
    Question 2: What should be an upper limit for counters of a Map Reduce job?
    A. ~5s
    B. ~15
    C. ~150
    D. ~50
    Question 3: Which of the following is the true about metadata?
    A. Metadata shows the structure of HDFS directories/files
    B. FsImage & EditLogs are metadata files
    C. Metadata contain information like number of blocks, their location, replicas
    D. All of the above
    Question 4: The ______ znode is used for synchronizing the changes made to the _acl_ table by the grant/revoke commands.
    A. zcl
    B. acl
    C. scl
    D. bnl
    Question 5: Point out the wrong statement:
    A. All the znodes are prefixed using the default /hbase location
    B. ZooKeeper provides an interactive shell that allows you to explore the ZooKeeper state
    C. The znodes that you’ll most often see are the ones that coordinate operations like Region Assignment
    D. All of the mentioned
    Question 6: In which process duplicate task is created to improve the overall execution time?
    A. Speculative execution
    B. Erasure coding
    C. NameNode High Availability
    D. HDFS Federation
    Question 7: Hadoop is open source
    A. Always True
    B. True only for Apache Hadoop
    C. True only for Apache and Cloudera Hadoop
    D. Always False
    Question 8: Hadoop differs from volunteer computing in
    A. Volunteers donating CPU time and not network bandwidth
    B. Volunteers donating network bandwidth and not CPU time
    C. Hadoop cannot search for large prime numbers
    D. Only Hadoop can use mapreduce
    Question 9: How are keys and values presented and passed to the reducers during a standard sort and shuffle phase of MapReduce?
    A. Keys are presented to reducer in sorted order; values for a given key are not sorted
    B. Keys are presented to reducer in sorted order; values for a given key are sorted in ascending order
    C. Keys are presented to a reducer in random order; values for a given key are not sorted
    D. Keys are presented to a reducer in random order; values for a given key are sorted in ascending order
    Question 10: Which one of the following stores data?
    A. Name node
    B. Data node
    C. Master node
    D. None of these