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Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) Sample Questions:

1. Determine which best describes when the reduce method is first called in a MapReduce job?

A) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed.
The programmer can configure in the job what percentage of the intermediate data should arrive before
the reduce method begins.
B) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed.
The reduce method is called as soon as the intermediate key-value pairs start to arrive.
C) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed.
The reduce method is called only after all intermediate data has been copied and sorted.
D) Reduce methods and map methods all start at the beginning of a job, in order to provide optimal
performance for map-only or reduce-only jobs.

2. What does the following WebHDFS command do?
Curl -1 -L "http://host:port/webhdfs/v1/foo/bar?op=OPEN"

A) Delete a directory /foo/bar
B) Make a directory /foo/bar
C) Read a file /foo/bar
D) List a directory /foo

3. In a large MapReduce job with m mappers and n reducers, how many distinct copy operations will there
be in the sort/shuffle phase?

A) n
B) m
C) m+n (i.e., m plus n)
D) mXn (i.e., m multiplied by n)
E) mn (i.e., m to the power of n)

4. Which one of the following is NOT a valid Oozie action?

A) pig
B) mrunit
C) mapreduce
D) hive

5. You wrote a map function that throws a runtime exception when it encounters a control character in input
data. The input supplied to your mapper contains twelve such characters totals, spread across five file
splits. The first four file splits each have two control characters and the last split has four control
characters.
Indentify the number of failed task attempts you can expect when you run the job with
mapred.max.map.attempts set to 4:

A) You will have seventeen failed task attempts
B) You will have twenty failed task attempts
C) You will have forty-eight failed task attempts
D) You will have twelve failed task attempts
E) You will have five failed task attempts

Solutions: