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最新的 CCDH CCD-333 免費考試真題:

1. During the standard sort and shuffle phase of MapReduce, keys and values are passed to reducers. Which of the following is true?

A) Keys are presented to a reducer in random order; values for a given key are not sorted.
B) Keys are presented to a reducer in soiled order; values for a given key are sorted in ascending order.
C) Keys are presented to a reducer in sorted order; values for a given key are not sorted.
D) Keys are presented to a reducer in random order; values for a given key are sorted in ascending order.

2. You have a large dataset of key-value pairs, where the keys are strings, and the values are integers. For each unique key, you want to identify the largest integer. In writing a MapReduce program to accomplish this, can you take advantage of a combiner?

A) Yes, as long as all the keys fit into memory on each node.
B) Yes, but the number of unique keys must be known in advance.
C) No, a combiner would not be useful in this case.
D) Yes, as long as all the integer values that share the same key fit into memory on each node.
E) Yes.

3. You use the hadoop fs -put command to write a 300 MB file using an HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file, what would another user see when trying to access this file?

A) They would see no content until the whole file is written and closed.
B) They would see the content of the file through the last completed block.
C) They would see Hadoop throw an concurrentFileAccessException when they try to access this file.
D) They would see the current state of the file, up to the last bit written by the command.

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. In a MapReduce job, the reducer receives all values associated with the same key. Which statement is most accurate about the ordering of these values?

A) The values are arbitrarily ordered, but multiple runs of the same MapReduce job will always have the same ordering.
B) The values are in sorted order.
C) Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted values.
D) The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce job.

問題與答案：