Exam Code: HADOOP-PR000007
Exam Name: Hortonworks Certified Apache Hadoop 2.0 Developer (Pig and Hive Developer)
Updated: May 11, 2024
Q&As: 108
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Which best describes what the map method accepts and emits?
A. It accepts a single key-value pair as input and emits a single key and list of corresponding values as output.
B. It accepts a single key-value pairs as input and can emit only one key-value pair as output.
C. It accepts a list key-value pairs as input and can emit only one key-value pair as output.
D. It accepts a single key-value pairs as input and can emit any number of key-value pair as output, including zero.
You are developing a MapReduce job for sales reporting. The mapper will process input keys representing the year (IntWritable) and input values representing product indentifies (Text).
Indentify what determines the data types used by the Mapper for a given job.
A. The key and value types specified in the JobConf.setMapInputKeyClass and JobConf.setMapInputValuesClass methods
B. The data types specified in HADOOP_MAP_DATATYPES environment variable
C. The mapper-specification.xml file submitted with the job determine the mapper's input key and value types.
D. The InputFormat used by the job determines the mapper's input key and value types.
Workflows expressed in Oozie can contain:
A. Sequences of MapReduce and Pig. These sequences can be combined with other actions including forks, decision points, and path joins.
B. Sequences of MapReduce job only; on Pig on Hive tasks or jobs. These MapReduce sequences can be combined with forks and path joins.
C. Sequences of MapReduce and Pig jobs. These are limited to linear sequences of actions with exception handlers but no forks.
D. Iterntive repetition of MapReduce jobs until a desired answer or state is reached.
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. mXn (i.e., m multiplied by n)
B. n
C. m
D. m+n (i.e., m plus n)
E. mn (i.e., m to the power of n)
A client application creates an HDFS file named foo.txt with a replication factor of 3. Identify which best describes the file access rules in HDFS if the file has a single block that is stored on data nodes A, B and C?
A. The file will be marked as corrupted if data node B fails during the creation of the file.
B. Each data node locks the local file to prohibit concurrent readers and writers of the file.
C. Each data node stores a copy of the file in the local file system with the same name as the HDFS file.
D. The file can be accessed if at least one of the data nodes storing the file is available.
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