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最新的 CCDH CCD-410 免費考試真題:

1. You need to perform statistical analysis in your MapReduce job and would like to call methods in the Apache Commons Math library, which is distributed as a 1.3 megabyte Java archive (JAR) file. Which is the best way to make this library available to your MapReducer job at runtime?

A) When submitting the job on the command line, specify the -libjars option followed by the JAR file path.
B) Package your code and the Apache Commands Math library into a zip file named JobJar.zip
C) Have your system administrator copy the JAR to all nodes in the cluster and set its location in the HADOOP_CLASSPATH environment variable before you submit your job.
D) Have your system administrator place the JAR file on a Web server accessible to all cluster nodes and then set the HTTP_JAR_URL environment variable to its location.

2. Which best describes what the map method accepts and emits?

A) It accepts a single key-value pairs as input and can emit any number of key-value pair as output, including zero.
B) It accepts a single key-value pair as input and emits a single key and list of corresponding values as output.
C) It accepts a single key-value pairs as input and can emit only one key-value pair as output.
D) It accepts a list key-value pairs as input and can emit only one key-value pair as output.

3. Workflows expressed in Oozie can contain:

A) Sequences of MapReduce and Pig. These sequences can be combined with other actions including forks, decision points, and path joins.
B) Sequences of MapReduce job only; on Pig on Hive tasks or jobs. These MapReduce sequences can be combined with forks and path joins.
C) Sequences of MapReduce and Pig jobs. These are limited to linear sequences of actions with exception handlers but no forks.
D) Iterntive repetition of MapReduce jobs until a desired answer or state is reached.

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

5. You want to perform analysis on a large collection of images. You want to store this data in HDFS and process it with MapReduce but you also want to give your data analysts and data scientists the ability to process the data directly from HDFS with an interpreted high-level programming language like Python. Which format should you use to store this data in HDFS?

A) XML
B) Avro
C) CSV
D) JSON
E) HTML
F) SequenceFiles

問題與答案：