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最新的 CCDH CCD-410 免費考試真題:

1. You want to populate an associative array in order to perform a map-side join. You've decided to put this information in a text file, place that file into the DistributedCache and read it in your Mapper before any records are processed.
Indentify which method in the Mapper you should use to implement code for reading the file and populating the associative array?

A) map
B) configure
C) init
D) combine

2. You need to create a job that does frequency analysis on input data. You will do this by writing a Mapper that uses TextInputFormat and splits each value (a line of text from an input file) into individual characters. For each one of these characters, you will emit the character as a key and an InputWritable as the value. As this will produce proportionally more intermediate data than input data, which two resources should you expect to be bottlenecks?

A) Processor and RAM
B) Processor and disk I/O
C) Disk I/O and network I/O
D) Processor and network I/O

3. In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling the next () method return?

A) It returns a reference to a Writable object from an object pool.
B) It returns a reference to a different Writable object time.
C) It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.
D) It 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) It returns a reference to the same Writable object each time, but populated with different data.

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

5. To process input key-value pairs, your mapper needs to lead a 512 MB data file in memory. What is the best way to accomplish this?

A) Place the data file in the DistributedCache and read the data into memory in the map method of the mapper.
B) Serialize the data file, insert in it the JobConf object, and read the data into memory in the configure method of the mapper.
C) Place the data file in the DataCache and read the data into memory in the configure method of the mapper.
D) Place the data file in the DistributedCache and read the data into memory in the configure method of the mapper.

問題與答案：

問題 #1 答案： B

問題 #2 答案： C

問題 #3 答案： E

問題 #4 答案： B

問題 #5 答案： C