Cloudera Exam CCA175 Topic 1 Question 34 Discussion

Actual exam question for Cloudera's CCA175 exam

Question #: 34
Topic #: 1

[All CCA175 Questions]

Problem Scenario 54 : You have been given below code snippet.

val a = sc.parallelize(List("dog", "tiger", "lion", "cat", "panther", "eagle"))

val b = a.map(x => (x.length, x))

operation1

Write a correct code snippet for operationl which will produce desired output, shown below.

Array[(lnt, String)] = Array((4,lion), (7,panther), (3,dogcat), (5,tigereagle))

ASolution :
b.foidByKey('')(_ + J.collect
foldByKey [Pair]
Very similar to fold, but performs the folding separately for each key of the RDD. This function is only available if the RDD consists of two-component tuples
Listing Variants
def foldByKey(zeroValue: V)(func: (V, V) => V): RDD[(K, V}]
def foldByKey(zeroValue: V, numPartitions: lnt)(func: (V, V) => V): RDD[(K, V)]
def foldByKey(zeroValue: V, partitioner: Partitioner)(func: (V, V) => V): RDD[(K, V}]

BSolution :
b.foidByKey('')(_ + J.collect
foldByKey [Pair]
Very similar to fold, but performs the folding separately for each key of the RDD. This function is only available if the RDD consists of two-component tuples
Listing Variants
def foldByKey(zeroValue: V)(func: (V, V) => V): RDD[(K, V}]
def foldByKey(zeroValue: V, numPartitions: lnt)(func: (V, V) => V): RDD[(K, V)]

Show Suggested Answer

Suggested Answer: A

by Tiera at Nov 15, 2022, 05:48 AM

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