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

1. You need to run the same job many times with minor variations. Rather than hardcoding all job
configuration options in your drive code, you've decided to have your Driver subclass
org.apache.hadoop.conf.Configured and implement the org.apache.hadoop.util.Tool interface.
Indentify which invocation correctly passes.mapred.job.name with a value of Example to Hadoop?

A) hadoop setproperty mapred.job.name=Example MyDriver input output
B) hadoop MyDriver mapred.job.name=Example input output
C) hadoop setproperty ("mapred.job.name=Example") MyDriver input output
D) hadoop MyDrive -D mapred.job.name=Example input output
E) hadoop "mapred.job.name=Example" MyDriver input output

2. You need to perform statistical analysis in your MapReduce job and would like to call methods in the
Apache Commons Math library, which is distributed as a 1.3 megabyte Java archive (JAR) file. Which is
the best way to make this library available to your MapReducer job at runtime?

A) Package your code and the Apache Commands Math library into a zip file named JobJar.zip
B) Have your system administrator copy the JAR to all nodes in the cluster and set its location in the
HADOOP_CLASSPATH environment variable before you submit your job.
C) When submitting the job on the command line, specify the -libjars option followed by the JAR file path.
D) Have your system administrator place the JAR file on a Web server accessible to all cluster nodes and
then set the HTTP_JAR_URL environment variable to its location.

3. Given the following Pig command:
logevents = LOAD 'input/my.log' AS (date:chararray, levehstring, code:int, message:string);
Which one of the following statements is true?

A) The logevents relation represents the data from the my.log file, using a tab as the parsing delimiter
B) The logevents relation represents the data from the my.log file, using a comma as the parsing delimiter
C) The statement is not a valid Pig command
D) The first field of logevents must be a properly-formatted date string or table return an error

4. In a MapReduce job, the reducer receives all values associated with same key. Which statement best
describes the ordering of these values?

A) The values are in sorted order.
B) The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce
job.
C) The values are arbitrary ordered, but multiple runs of the same MapReduce job will always have the
same ordering.
D) Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted
values.

5. Review the following 'data' file and Pig code.

Which one of the following statements is true?

A) The code executes successfully but there is not output because the D relation is empty
B) The output of the dump d command is (M, {(38,95in),(62,95i02)})
C) The code does not execute successfully because D is not a valid relation
D) The Output Of the DUMP D command IS (M,{(M,62.95102),(M,38,95111)})

Solutions: