22. Does the MapReduce programming model provide a way for reduce tasks to communicate with each other?

a. Yes, each reduce task runs and communicates with other reduce tasks

b. No, each reduce task runs and communicates with other map tasks

c. No, each reduce task runs independently and in isolation

d. No, each reduce task runs and communicates with other Name node

23. What describes the relationship between MapReduce and Hive?

a. Hive provides no additional capabilities to MapReduce. Hive programs are executed as MapReduce jobs via the Hive interpreter.

b. Hive is made by Yahoo

c. Hive is data flow language based.

d. Hive converts Hive codes to Java MapReduce codes

24. The cluster block size is set to 128MB. The input file contains 260MB of valid input data and is loaded into HDFS with the default block size. How many map tasks will be run during the execution of this job?

a. 2

b.3

c. 1

d. The job fails

25. You have the following key-value pairs as output from your Map task. How many input key-values pairs are for reducer(s): (red, 1) (apple, 1) (green, 1) (apple, 1) (golden, 1) (apple, 1)

a. 3

b. 4

c. 5

d. 6

26. What data is provided to the reduce()method of a reducer?

a. The reduce() method is given a (key, value) pair

b. The reduce() method is given an iterator over all available values from any key

c. The reduce() method is given a single key and an iterator over all available values for that key

d. The reduce() method is given a single key and a value for that key

27. Assuming typical disk data transfer rate is 75MB/sec, approximately how long it takes to transfer 100GB of data to the processor?

a. 11 minutes

b. 22 minutes

c. 33 minutes

d. 44 minutes