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最新的 CCDH CCD-333 免費考試真題:

1. The NameNode uses RAM for the following purpose:

A) To manage distributed read and write locks on files in HDFS.
B) To store the contents of files in HDFS.
C) To store filenames, list of blocks and other meta information.
D) To store the edits log that keeps track of changes in HDFS.

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. For each input key-value pair, mappers can emit:

A) One intermediate key value pair, of a different type.
B) As many intermediate key value pairs as desired, as long as all the keys have the same type and all the values have the same type.
C) As many intermediate key-value pairs as desired, but they cannot be of the same type as the input key-value pair.
D) One intermediate key value pair, but of the same type.
E) As many intermediate key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).

4. When is the reduce method first called in a MapReduce job?

A) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed. The reduce method is called only after all intermediate data has been copied and sorted.
B) Reducers start copying intermediate key value pairs from each Mapper as soon as it has completed. The reduce method is called as soon as the intermediate key-value pairs start to arrive.
C) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed. The programmer can configure in the job what percentage of the intermediate data should arrive before the reduce method begins.
D) Reduce methods and map methods all start at the beginning of a job, in order to provide optimal performance for map-only or reduce-only jobs.

5. Your Custer's HOFS block size is 64MB. You have a directory containing 100 plain text files, each of which Is 100MB in size. The InputFormat for your job is TextInputFormat. How many Mappers will run?

A) 100
B) 64
C) 640
D) 200

問題與答案：