Cloudera Certified Developer for Apache Hadoop (CCDH) : CCD-410

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Cloudera CCD-410 考試大綱主題:

最新的 CCDH CCD-410 免費考試真題：

1. You use the hadoop fs -put command to write a 300 MB file using and 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 life?

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

2. Identify the tool best suited to import a portion of a relational database every day as files into HDFS, and generate Java classes to interact with that imported data?

A) Hive
B) Oozie
C) fuse-dfs
D) Sqoop
E) Flume
F) Hue
G) Pig

3. Given a directory of files with the following structure: line number, tab character, string:
Example:
1abialkjfjkaoasdfjksdlkjhqweroij
2kadfjhuwqounahagtnbvaswslmnbfgy
3kjfteiomndscxeqalkzhtopedkfsikj
You want to send each line as one record to your Mapper. Which InputFormat should you use to complete the line: conf.setInputFormat (____.class) ; ?

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

4. You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys, IntWritable values. Which interface should your class implement?

A) Mapper <Text, IntWritable, Text, IntWritable>
B) Reducer <Text, IntWritable, Text, IntWritable>
C) Reducer <Text, Text, IntWritable, IntWritable>
D) Combiner <Text, IntWritable, Text, IntWritable>
E) Combiner <Text, Text, IntWritable, IntWritable>

5. For each intermediate key, each reducer task can emit:

A) As many final key-value pairs as desired, but they must have the same type as the intermediate key-value pairs.
B) As many final key-value pairs as desired, as long as all the keys have the same type and all the values have the same type.
C) One final key-value pair per key; no restrictions on the type.
D) As many final key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).
E) One final key-value pair per value associated with the key; no restrictions on the type.

問題與答案：