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Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer Sample Questions:
1. For each intermediate key, each reducer task can emit:
A) As many final key-value pairs as desired, but they must have the same type as the intermediate key-value pairs.
B) As many final key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).
C) As many final key-value pairs as desired, as long as all the keys have the same type and all the values have the same type.
D) One final key-value pair per key; no restrictions on the type.
E) One final key-value pair per value associated with the key; no restrictions on the type.
2. Which one of the following statements describes a Hive user-defined aggregate function?
A) Operates on a single input row and produces a single row as output
B) Operates on a single input row and produces a table as output
C) Operates on multiple input rows and creates a single row as output
D) Operates on multiple input rows and produces a table as output
3. Can you use MapReduce to perform a relational join on two large tables sharing a key? Assume that the two tables are formatted as comma-separated files in HDFS.
A) Yes, but only if one of the tables fits into memory
B) Yes.
C) No, MapReduce cannot perform relational operations.
D) Yes, so long as both tables fit into memory.
E) No, but it can be done with either Pig or Hive.
4. 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) 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.
B) When submitting the job on the command line, specify the -libjars option followed by the JAR file path.
C) Package your code and the Apache Commands Math library into a zip file named JobJar.zip
D) 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.
5. Which of the following tool was designed to import data from a relational database into HDFS?
A) Sqoop
B) Flume
C) Ambari
D) HCatalog
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: C | Question # 3 Answer: B | Question # 4 Answer: B | Question # 5 Answer: A |
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