ft day2

What happens if a number of reducers are set to 0?

• Reduce-only job take place

• Map-only job take place

• Reducer output will be the final output

The number of maps is usually driven by the total number of

• Tasks

• Inputs splits

• Outputs splits

Which among the following is the programming model designed for processing large volumes of data in parallel by dividing the work into a set of independent tasks.

• MapReduce

• HDFS

• Pig

• All the above

Which of the following phases occur simultaneously

• Shuffle and Map

• Shuffle and Sort

• Reduce and Sort

In HDFS put command is used to

• Copy files from local file system to HDFS.

• Copy files or directories from local file system to HDFS

• Copy files from from HDFS to local filesystem.

• Copy files or directories from HDFS to local filesystem.

Which of the following is not the phase of Reducer?

• Shuffle

• Sort

• Map

• Reduce

Mappers sorted output is Input to the

• Reducer

• Mapper

• Shuffle

Which of the following is true about combiner

• Reduces network congestion

• Execution of combiner is not guaranteed

• Both the above

What statement is true about InputSplit?

• Logical representation of data

• Physical representation of data

• Both the above

Aggregation cannot be done in Mapper in MapReduce

• True

• False