CCD-410 by Cloudera Actual Free Exam Questions And Answers

Question 1

You need to move a file titled "weblogs" into HDFS. When you try to copy the file, you can't. You know you have ample space on your DataNodes. Which action should you take to relieve this situation and store more files in HDFS?

A. Decrease the block size on your remaining files.

B. Increase the block size on all current files in HDFS.

C. Decrease the block size on all current files in HDFS.

D. Increase the number of disks (or size) for the NameNode.

E. Increase the block size on your remaining files.

F. Increase the amount of memory for the NameNode.

Discussion 0

Correct Answer: A Vote an answer

Question 2

In a MapReduce job, you want each of your input files processed by a single map task. How do you configure a MapReduce job so that a single map task processes each input file regardless of how many blocks the input file occupies?

A. Write a custom MapRunner that iterates over all key-value pairs in the entire file.

B. Increase the parameter that controls minimum split size in the job configuration.

C. Write a custom FileInputFormat and override the method isSplitable to always return false.

D. Set the number of mappers equal to the number of input files you want to process.

Discussion 0

Correct Answer: C Vote an answer

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Question 3

Which project gives you a distributed, Scalable, data store that allows you random, realtime read/write access to hundreds of terabytes of data?

Discussion 0

Correct Answer: G Vote an answer

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Question 4

The Hadoop framework provides a mechanism for coping with machine issues such as faulty configuration or impending hardware failure. MapReduce detects that one or a number of machines are performing poorly and starts more copies of a map or reduce task. All the tasks run simultaneously and the task finish first are used. This is called:

A. IdentityMapper

B. Default Partitioner

C. Combine

D. IdentityReducer

E. Speculative Execution

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Correct Answer: E Vote an answer

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Question 5

You have written a Mapper which invokes the following five calls to the OutputColletor.collect method:
output.collect (new Text ("Apple"), new Text ("Red") ) ;
output.collect (new Text ("Banana"), new Text ("Yellow") ) ;
output.collect (new Text ("Apple"), new Text ("Yellow") ) ;
output.collect (new Text ("Cherry"), new Text ("Red") ) ;
output.collect (new Text ("Apple"), new Text ("Green") ) ;
How many times will the Reducer's reduce method be invoked?

Discussion 0

Correct Answer: D Vote an answer

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Question 6

Which best describes how TextInputFormat processes input files and line breaks?

A. Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReaders of both splits containing the broken line.

B. Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the beginning of the broken line.

C. The input file is split exactly at the line breaks, so each RecordReader will read a series of complete lines.

D. Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the end of the broken line.

E. Input file splits may cross line breaks. A line that crosses file splits is ignored.

Discussion 0

Correct Answer: B Vote an answer

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Cloudera Certified Developer for Apache Hadoop (CCDH) - CCD-410 Exam Practice Test

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