Free Access Huawei.H13-723_V2.0.v2022-09-27.q125 Practice Test (Page 17)

existSpark, assuminglinesIs anDStreamobject, which of the following statements can periodically count this number of words on a stream?

A.lines.flatMap(_.split(" ")).flatmap(word =>(word,1)).groupByKey(_+_).print ( )

B.lines.flatMap(_.split(" ")).map(word =>(word,1)).reduce(_+_).print( )

C.lines.flatMap(_.split(" ")).map(word =>(word,word.length())).reduceByKey (_+_).print( )

D.lines.flatMap(_.split(" ")).map(word =>(word,1)).reduceByKey(_+_).print ( )

HDFSWhich of the following business scenarios is not applicable to?

A.Lots of small file storage

B.Mass data storage

C.large file storage

D.Streaming file storage

forHBase rowkeyThe design principles described below are correct? (multiple choice)

A.Attribute values with good dispersion are placed inRowkeysecond half

B.Attribute values with high access weight are placed inRowkeysecond half

C.Attribute values with good dispersion are placed inRowkeyfirst half

D.Attribute values with high access weight are placed inRowKeyFront

Spark StreamingAs a micro-batch stream processing engine, it converts the data of each time slice into OneRDDa partition in the

A.True

B.False

Which of the following descriptions about massive small file storage is correct ( )?
(multiple choice)

A.HDFSStoring a large number of small files will giveNameNodebring great pressure.

B.The above statement is not correct.

C.HBaseStore a large number of small files,Compactionwill bringIOWaste of resources.

D.HuaweiHFSIt is suitable for storing a large number of small files, and files can be selectively stored inHDFSorMOBmiddle.

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