Huawei Exam H13-723_V2.0 Topic 5 Question 48 Discussion

Actual exam question for Huawei's H13-723_V2.0 exam

Question #: 48
Topic #: 5

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

Alines.flatMap(_.split(' ')).map(word =>(word,1)).reduce(_+_).print( )

Blines.flatMap(_.split(' ')).map(word =>(word,word.length())).reduceByKey
(_+_).print( )

Clines.flatMap(_.split(' ')).map(word =>(word,1)).reduceByKey(_+_).print
( )

Dlines.flatMap(_.split(' ')).flatmap(word =>(word,1)).groupByKey(_+_).print
( )

Show Suggested Answer

Suggested Answer: A

by Jesse at Sep 13, 2024, 03:22 PM

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18 hours ago

Haha, 'assuminglinesIs anDStreamobject' - that's a bit of a mouthful! Option C seems the most straightforward to me.

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4 days ago

Hmm, you might be right. I see your point. Option C does seem like a better approach for counting words in a stream.

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5 days ago

I disagree, I believe option C is the right choice as it correctly maps each word to a count and then reduces by key to get the total count.

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6 days ago

I'm not sure about the difference between reduce and reduceByKey. Looks like option C is the way to go though.

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8 days ago

Option C looks good to me. It splits the lines into words, maps each word to a (word, 1) pair, and then reduces by key to get the count of each word.

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9 days ago

I think option A is correct because it splits the lines into words and then counts the occurrences of each word.

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