Explanation:The right number of reduces seems to be 0.95 or 1.75. 5. Point out the wrong statement :
A. Reducer has 2 primary phases
B. Increasing the number of reduces increases the framework overhead, but increases load balancing and lowers the cost of failures
C. It is legal to set the number of reduce-tasks to zero if no reduction is desired
D. The framework groups Reducer inputs by keys (since different mappers may have output the same key) in sort stage
Answer:A
Explanation:The right number of reduces seems to be 0.95 or 1.75. 5. Point out the wrong statement :
A. Reducer has 2 primary phases B. Increasing the number of reduces increases the framework overhead, but increases load balancing and lowers the cost of failures C. It is legal to set the number of reduce-tasks to zero if no reduction is desired D. The framework groups Reducer inputs by keys (since different mappers may have output the same key) in sort stage
Explanation:Reducer has 3 primary phases: shuffle, sort and reduce. 6. The output of the _______ is not sorted in the Mapreduce framework for Hadoop.