Map Reduce Quiz

Q.What is the default HDFS replication factor?

  • 2
  • 1
  • 3

Q.The client reading the data from HDFS filesystem in Hadoop does which of the following?

  • Gets the data from the namenode
  • Gets only the block locations form the namenode

Q. The output of the reduce task is typically written to the FileSystem via _____________

  • OutputCollector.collect
  • OutputCollector.put
  • OutputCollector.get
  • None of these

Q.The Hadoop MapReduce framework spawns one map task for each __________ generated by the InputFormat for the job.

  • OutputSplit
  • InputSplit

Q.The Mapper implementation processes one line at a time via _________ method.

  • Map
  • reduce
  • Mapper

Q.Users can control which keys (and hence records) go to which Reducer by implementing a custom :

  • Reporter
  • Partitioner

Q.Find the wrong statement

  • None of These
  • The Mapper outputs are sorted and then partitioned per Reducer
  • The total number of partitions is the same as the number of reduce tasks for the job

Q.The right level of parallelism for maps seems to be around _________ maps per-node

  • 1-10
  • 10-100
  • 100-1000

Q.Which of the following phases occur simultaneously ?

  • Shuffle and Map
  • Shuffle and Sort

Q. _________ is the default Partitioner for partitioning key space.

  • Partitioner
  • HashPair
  • HashPartitionaer

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