Ensurepass  QUESTION 31 MapReduce is well-suited for all of the following applications EXCEPT? (Choose one):   A. Text mining on a large collections of unstructured documents. B. Analysis of large amounts of Web logs (queries, clicks, etc.). C. Online transaction processing (OLTP) for an e-commerce Website. D. Graph mining on a large social network (e.g., Facebook friends network).   Answer: C Explanation: Hadoop Map/Reduce is designed for batch-oriented work load. MapReduce Read more [...]
Ensurepass  QUESTION 21 Which of the following best describes the map method input and output?   A. It accepts a single key-value pair as input and can emit only one key-value pair as output. B. It accepts a list of key-value pairs as input hut run emit only one key value pair as output. C. It accepts a single key-value pair as input and emits a single key and list of corresponding values as output D. It accepts a single key-value pair as input and can emit any number of key-value Read more [...]
Ensurepass  QUESTION 11 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 file in HDFS.   A. Yes. B. Yes, but only if one of the tables fits into memory. C. Yes, so long as both tables fit into memory. D. No, MapReduce cannot perform relational operations. E. No, but it can be done with either Pig or Hive.   Answer: A Explanation: Note: * Join Read more [...]
Ensurepass  Exam A   QUESTION 1 In the reducer, the MapReduce API provides you with an iterator over Writable values. Calling the next () method:   A. Returns a reference to a different Writable object each time. B. Returns a reference to a Writable object from an object pool. C. Returns a reference to the same writable object each time, but populated with different data. D. Returns a reference to a Writable object. The API leaves unspecified whether this is a reused Read more [...]