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最新的 CCDH CCD-333 免費考試真題:

1. Given a directory of files with the following structure: line number, tab character, string:
Example:
1.abialkjfjkaoasdfjksdlkjhqweroij
2.kadf jhuwqounahagtnbvaswslmnbfgy
3.kjfteiomndscxeqalkzhtopedkfslkj
You want to send each line as one record to your Mapper. Which InputFormat would you use to complete the line: setInputFormat (________.class);

A) KeyValueTextInputFormat
B) SequenceFileAsTextInputFormat
C) BDBInputFormat
D) SequenceFileInputFormat

2. Can you use MapReduce to perform a relational join on two large tables sharing a key? Assume that the two tables are formatted as comma-separated file in HDFS.

A) Yes.
B) Yes, but only if one of the tables fits into memory.
C) No, but it can be done with either Pig or Hive.
D) No, MapReduce cannot perform relational operations.
E) Yes, so long as both tables fit into memory.

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. Does the MapReduce programming model provide a way for reducers to communicate with each other?

A) No, each reducer runs independently and in isolation.
B) Yes, reducers can communicate with each other by dispatching intermediate key value pairs that get shuffled to another reduce
C) Yes, reducers running on the same machine can communicate with each other through shared memory, but not reducers on different machines.
D) Yes, all reducers can communicate with each other by passing information through the jobconf object.

5. Which happens if the NameNode crashes?

A) The Secondary NameNode seamlessly takes over and there is no service interruption.
B) HDFS becomes temporarily unavailable until an administrator starts redirecting client requests to the Secondary NameNode.
C) HDFS becomes unavailable to new MapReduce jobs, but running jobs will continue until completion.
D) HDFS becomes unavailable until the NameNode is restored.

問題與答案：