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

existSpark, assuminglinesIs anDStreamobject, which of the following statements can periodically count this number of words on a stream?
A) lines.flatMap(_.split(' ')).map(word =>(word,1)).reduce(_+_).print( )
B) lines.flatMap(_.split(' ')).map(word =>(word,word.length())).reduceByKey (_+_).print( )
C) lines.flatMap(_.split(' ')).map(word =>(word,1)).reduceByKey(_+_).print ( )
D) lines.flatMap(_.split(' ')).flatmap(word =>(word,1)).groupByKey(_+_).print ( )

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

Actual exam question for Huawei's H13-723_V2.0 exam
Question #: 48
Topic #: 5
[All H13-723_V2.0 Questions]

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

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Suggested Answer: A

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

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Arlie
10 months ago
I’m surprised B is even an option, it doesn’t count words correctly!
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Brinda
10 months ago
Wait, can you really use reduceByKey like that?
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Sharee
10 months ago
D looks wrong, flatmap should be flatMap.
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Huey
11 months ago
I think C might work too, but not as efficiently.
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Tyra
11 months ago
A is definitely the right choice!
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Nana
11 months ago
Option D seems off to me; I don't recall using flatmap like that. I think it should be flatMap instead of flatmap.
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Karl
11 months ago
I remember we did a similar question where we used flatMap and reduceByKey. I feel like option A might be incorrect because it uses reduce instead of reduceByKey.
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Dominga
11 months ago
I'm not entirely sure about option B; it seems like it might be counting the length of words instead of the number of words.
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Portia
12 months ago
I think option C looks familiar; it uses reduceByKey, which we practiced in class for counting words.
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Barbra
12 months ago
I'm not entirely sure about this one. I'll need to think it through step-by-step to make sure I'm understanding the logic correctly. Maybe I'll jot down some notes before selecting an answer.
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Richelle
12 months ago
This seems straightforward. Option C is the clear winner - it's splitting the lines, mapping each word to a (word, 1) pair, and then reducing by key to get the final word counts.
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Rasheeda
12 months ago
I'm a bit confused by the syntax here. I'll need to review my notes on Spark streaming to make sure I understand how to properly use the flatMap, map, and reduceByKey functions.
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Mireya
12 months ago
Okay, I think I've got this. Option C looks like the right way to count the words on the stream. I'll go with that one.
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Robt
12 months ago
Hmm, this looks like a tricky one. I'll need to carefully read through the options and think about the differences between them.
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Santos
12 months ago
I definitely recall checking active calls being part of it, but I can't remember if it was all three actions we need to pick.
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Nan
1 year ago
Is it just me, or does this question make it sound like Spark has a sense of humor? Option C is the one.
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Luis
1 year ago
User1: Okay, I'll trust you guys. Option C it is.
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Tyra
1 year ago
User3: I'm going with option C as well.
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Alpha
1 year ago
User2: No, I believe it's option C.
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Leah
1 year ago
User1: I think option A is the correct one.
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Lyndia
1 year ago
Haha, 'assuminglinesIs anDStreamobject' - that's a bit of a mouthful! Option C seems the most straightforward to me.
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Merilyn
1 year ago
I think option A could also work, it's a common way to count words in a stream.
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Chau
1 year ago
I agree, option C looks like the simplest way to count the words.
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Elouise
1 year 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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Eden
1 year 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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Kenny
1 year 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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Rhea
1 year 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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Lai
1 year ago
User 4: Option D doesn't look right to me, it seems like a mistake.
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Mitsue
1 year ago
User 3: I'm not sure, but option B also seems like a good option.
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Levi
1 year ago
User 2: I disagree, I believe option C is the best choice.
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Vonda
1 year ago
User 1: I think option A is the correct one.
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Elouise
1 year 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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