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最新的 CCDH CCD-333 免費考試真題:

1. You've written a MapReduce job that will process 500 million input records and generate 500 million key-value pairs. The data is not uniformly distributed. Your MapReduce job will create a significant amount of intermediate data that it needs to transfer between mappers and reducers which is a potential bottleneck. A custom implementation of which of the following interfaces is most likely to reduce the amount of intermediate data transferred across the network?

A) WritableComparable
B) OutputFormat
C) InputFormat
D) Writable
E) Partitioner
F) Combiner

2. Combiners Increase the efficiency of a MapReduce program because:

A) They provide an optimization and reduce the total number of computations that are needed to execute an algorithm by a factor of n, where is the number of reducer.
B) They aggregate intermediate map output locally on each individual machine and therefore reduce the amount of data that needs to be shuffled across the network to the reducers.
C) They provide a mechanism for different mappers to communicate with each Other, thereby reducing synchronization overhead.
D) They aggregate intermediate map output horn a small number of nearby (i.e., rack-local) machines and therefore reduce the amount of data that needs to be shuffled across the network to the reducers.

3. All keys used for intermediate output from mappers must do which of the following:

A) Be a subclass of Filelnput-Format
B) Be compressed using a splittable compression algorithm.
C) Use a comparator for speedy sorting
D) Override isSplitable
E) Implement WritableComparable

4. In the reducer, the MapReduce API provides you with an iterator over Writable values. Calling the next () method:

A) Returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.
B) Returns a reference to the same writable object each time, but populated with different data.
C) Returns a reference to a Writable object from an object pool.
D) Returns a reference to the same writable object if the next value is the same as the previous value, or a new writable object otherwise.
E) Returns a reference to a different Writable object each time.

5. You have written a Mapper which invokes the following five calls to the outputcollector.collect method:

How many times will the Reducer's reduce method be invoked.

A) 0
B) 1
C) 6
D) 3
E) 5

問題與答案：