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