最新的Cloudera CCD-410免費考試真題

問題1

You have a directory named jobdata in HDFS that contains four files: _first.txt, second.txt, .third.txt and #data.txt. How many files will be processed by the FileInputFormat.setInputPaths () command when it's given a path object representing this directory?

A. Three, the pound sign is an invalid character for HDFS file names

B. Two, file names with a leading period or underscore are ignored

C. Four, all files will be processed

D. None, the directory cannot be named jobdata

E. One, no special characters can prefix the name of an input file

正確答案: B

說明：（僅 Fast2test 成員可見）

問題2

Identify the MapReduce v2 (MRv2 / YARN) daemon responsible for launching application containers and monitoring application resource usage?

A. ResourceManager

B. NodeManager

C. JobTracker

D. TaskTracker

E. ApplicationMasterService

F. ApplicationMaster

正確答案: B

說明：（僅 Fast2test 成員可見）

問題3

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 your remaining files.

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

D. Increase the amount of memory for the NameNode.

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

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

正確答案: A

問題4

What types of algorithms are difficult to express in MapReduce v1 (MRv1)?

A. Algorithms that require applying the same mathematical function to large numbers of individual binary records.

B. Relational operations on large amounts of structured and semi-structured data.

C. Large-scale graph algorithms that require one-step link traversal.

D. Text analysis algorithms on large collections of unstructured text (e.g, Web crawls).

E. Algorithms that require global, sharing states.

正確答案: E

說明：（僅 Fast2test 成員可見）

問題5

Assuming default settings, which best describes the order of data provided to a reducer's reduce method:

A. The keys given to a reducer aren't in a predictable order, but the values associated with those keys always are.

B. Both the keys and values passed to a reducer always appear in sorted order.

C. Neither keys nor values are in any predictable order.

D. The keys given to a reducer are in sorted order but the values associated with each key are in no predictable order

正確答案: D

說明：（僅 Fast2test 成員可見）

問題6

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?

A. 3

B. 1

C. 5

D. 0

E. 6

正確答案: A

說明：（僅 Fast2test 成員可見）

最新的Cloudera Certified Developer for Apache Hadoop (CCDH) - CCD-410免費考試真題

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