Developing MapReduce Applications MCQ

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• During the execution of a streaming job, the names of the . . . . . . . . parameters are transformed.
  ক

  vmap

  খ

  mapvim

  গ

  mapreduce

  ঘ

  mapred
• . . . . . . . . communicate with the client and handle data-related operations.
  ক

  Master Server

  খ

  Region Server

  গ

  Htable

  ঘ

  All of the mentioned
• The . . . . . . . . executes the Mapper/ Reducer task as a child process in a separate jvm.
  ক

  JobTracker

  খ

  TaskTracker

  গ

  TaskScheduler

  ঘ

  None of the mentioned
• . . . . . . . . is used to filter log files from the output directory listing.
  ক

  OutputLog

  খ

  OutputLogFilter

  গ

  DistributedLog

  ঘ

  DistributedJars
• Maximum virtual memory of the launched child-task is specified using . . . . . . . .
  ক

  mapv

  খ

  mapred

  গ

  mapvim

  ঘ

  All of the mentioned
• . . . . . . . . is the primary interface by which user-job interacts with the JobTracker.
  ক

  JobConf

  খ

  JobClient

  গ

  JobServer

  ঘ

  All of the mentioned
• The . . . . . . . . class provides the getValue() method to read the values from its instance.
  ক

  Get

  খ

  Result

  গ

  Put

  ঘ

  Value
• The standard output (stdout) and error (stderr) streams of the task are read by the TaskTracker and logged to . . . . . . . .
  ক

  ${HADOOP_LOG_DIR}/user

  খ

  ${HADOOP_LOG_DIR}/userlogs

  গ

  ${HADOOP_LOG_DIR}/logs

  ঘ

  None of the mentioned
• . . . . . . . . is percentage of memory relative to the maximum heap size in which map outputs may be retained during the reduce.
  ক

  mapred.job.shuffle.merge.percent

  খ

  mapred.job.reduce.input.buffer.percen

  গ

  mapred.inmem.merge.threshold

  ঘ

  io.sort.factor
• You can delete a column family from a table using the method . . . . . . . . of HBAseAdmin class.
  ক

  delColumn()

  খ

  removeColumn()

  গ

  deleteColumn()

  ঘ

  all of the mentioned
• HBase uses the . . . . . . . . File System to store its data.
  ক

  Hive

  খ

  Imphala

  গ

  Hadoop

  ঘ

  Scala
• . . . . . . . . is the main configuration file of HBase.
  ক

  hbase.xml

  খ

  hbase-site.xml

  গ

  hbase-site-conf.xml

  ঘ

  none of the mentioned
• . . . . . . . . class adds HBase configuration files to its object.
  ক

  Configuration

  খ

  Collector

  গ

  Component

  ঘ

  None of the mentioned
• The right level of parallelism for maps seems to be around . . . . . . . . maps per-node.
  ক

  1-10

  খ

  10-100

  গ

  100-150

  ঘ

  150-200
• . . . . . . . . can change the maximum number of cells of a column family.
  ক

  set

  খ

  reset

  গ

  alter

  ঘ

  select
• Jobs can enable task JVMs to be reused by specifying the job configuration . . . . . . . .
  ক

  mapred.job.recycle.jvm.num.tasks

  খ

  mapissue.job.reuse.jvm.num.tasks

  গ

  mapred.job.reuse.jvm.num.tasks

  ঘ

  all of the mentioned
• Map output larger than . . . . . . . . percent of the memory allocated to copying map outputs.
  ক

  10

  খ

  15

  গ

  25

  ঘ

  35
• The Mapper implementation processes one line at a time via . . . . . . . . method.
  ক

  map

  খ

  reduce

  গ

  mapper

  ঘ

  reducer
• . . . . . . . . specifies the number of segments on disk to be merged at the same time.
  ক

  mapred.job.shuffle.merge.percent

  খ

  mapred.job.reduce.input.buffer.percen

  গ

  mapred.inmem.merge.threshold

  ঘ

  io.sort.factor
• What is the primary function of the Hadoop Reducer class in a MapReduce application?
  ক

  Aggregate values on the reducer side

  খ

  Generate intermediate key-value pairs

  গ

  Execute MapReduce jobs

  ঘ

  Read and parse input data
• What is the purpose of the Hadoop RecordReader in a MapReduce job?
  ক

  Reads and parses input data

  খ

  Manages computation resources

  গ

  Executes MapReduce jobs

  ঘ

  Manages Hadoop ecosystem tools
• In a MapReduce application, what is the role of the Hadoop Job object?
  ক

  Manages computation resources

  খ

  Manages task execution in MapReduce jobs

  গ

  Manages metadata of HDFS

  ঘ

  Executes MapReduce jobs
• What is the function of the Hadoop Mapper.Context in a MapReduce application?
  ক

  Generate intermediate key-value pairs

  খ

  Manages computation resources

  গ

  Execute MapReduce jobs

  ঘ

  Read and parse input data
• In a MapReduce program, what is the purpose of the Hadoop OutputCommitter?
  ক

  Manage storage layer

  খ

  Manage computation resources

  গ

  Execute MapReduce jobs

  ঘ

  Manage Hadoop ecosystem tools
• What is the significance of the Hadoop JobClient in a MapReduce job?
  ক

  Manage computation resources

  খ

  Manage task execution in MapReduce jobs

  গ

  Execute MapReduce jobs

  ঘ

  Manage Hadoop ecosystem tools
• In a MapReduce application, what does the term "InputFormat" represent?
  ক

  Defines how input data is read

  খ

  Defines the map output format

  গ

  Defines the reduce output format

  ঘ

  Defines the partitioning logic
• What is the role of the Hadoop TaskInputOutputContext in a MapReduce job?
  ক

  Manages computation resources

  খ

  Manages task execution in MapReduce jobs

  গ

  Executes MapReduce jobs

  ঘ

  Manages Hadoop ecosystem tools
• What is the primary function of the Hadoop Partitioner in a MapReduce application?
  ক

  Distribute data across multiple nodes

  খ

  Combine intermediate key-value pairs on the mapper side

  গ

  Sort and shuffle data

  ঘ

  Determine the reducer for each key
• In a MapReduce job, what does the term "Combiner" represent?
  ক

  Combine intermediate key-value pairs on the mapper side

  খ

  Aggregate values on the reducer side

  গ

  Sort and shuffle data

  ঘ

  Distribute data to reducers
• What is the role of the Hadoop Job object in a MapReduce application?
  ক

  Manages computation resources

  খ

  Manages task execution in MapReduce jobs

  গ

  Manages metadata of HDFS

  ঘ

  Executes MapReduce jobs