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  • Exam Name: CCA Spark and Hadoop Developer Exam
  • Last Update: 28-Mar-2024
  • Questions and Answers: 96
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CCA175 Questions and Answers

Question # 1

Problem Scenario 96 : Your spark application required extra Java options as below. -XX:+PrintGCDetails-XX:+PrintGCTimeStamps

Please replace the XXX values correctly

./bin/spark-submit --name "My app" --master local[4] --conf spark.eventLog.enabled=talse --conf XXX hadoopexam.jar

Question # 2

Problem Scenario 41 : You have been given below code snippet.

val aul = sc.parallelize(List (("a" , Array(1,2)), ("b" , Array(1,2))))

val au2 = sc.parallelize(List (("a" , Array(3)), ("b" , Array(2))))

Apply the Spark method, which will generate below output.

Array[(String, Array[lnt])] = Array((a,Array(1, 2)), (b,Array(1, 2)), (a(Array(3)), (b,Array(2)))

Question # 3

Problem Scenario 75 : You have been given MySQL DB with following details.

user=retail_dba

password=cloudera

database=retail_db

table=retail_db.orders

table=retail_db.order_items

jdbc URL = jdbc:mysql://quickstart:3306/retail_db

Please accomplish following activities.

1. Copy "retail_db.order_items" table to hdfs in respective directory p90_order_items .

2. Do the summation of entire revenue in this table using pyspark.

3. Find the maximum and minimum revenue as well.

4. Calculate average revenue

Columns of ordeMtems table : (order_item_id , order_item_order_id , order_item_product_id, order_item_quantity,order_item_subtotal,order_ item_subtotal,order_item_product_price)

Question # 4

Problem Scenario 68 : You have given a file as below.

spark75/f ile1.txt

File contain some text. As given Below

spark75/file1.txt

Apache Hadoop is an open-source software framework written in Java for distributed storage and distributed processing of very large data sets on computer clusters built from commodity hardware. All the modules in Hadoop are designed with a fundamental assumption that hardware failures are common and should be automatically handled by the framework

The core of Apache Hadoop consists of a storage part known as Hadoop Distributed File System (HDFS) and a processing part called MapReduce. Hadoop splits files into large blocks and distributes them across nodes in a cluster. To process data, Hadoop transfers packaged code for nodes to process in parallel based on the data that needs to be processed.

his approach takes advantage of data locality nodes manipulating the data they have access to to allow the dataset to be processed faster and more efficiently than it would be in a more conventional supercomputer architecture that relies on a parallel file system where computation and data are distributed via high-speed networking

For a slightly more complicated task, lets look into splitting up sentences from our documents into word bigrams. A bigram is pair of successive tokens in some sequence. We will look at building bigrams from the sequences of words in each sentence, and then try to find the most frequently occuring ones.

The first problem is that values in each partition of our initial RDD describe lines from the file rather than sentences. Sentences may be split over multiple lines. The glom() RDD method is used to create a single entry for each document containing the list of all lines, we can then join the lines up, then resplit them into sentences using "." as the separator, using flatMap so that every object in our RDD is now a sentence.

A bigram is pair of successive tokens in some sequence. Please build bigrams from the sequences of words in each sentence, and then try to find the most frequently occuring ones.

Question # 5

Problem Scenario 7 : You have been given following mysql database details as well as other info.

user=retail_dba

password=cloudera

database=retail_db

jdbc URL = jdbc:mysql://quickstart:3306/retail_db

Please accomplish following.

1. Import department tables using your custom boundary query, which import departments between 1 to 25.

2. Also make sure each tables file is partitioned in 2 files e.g. part-00000, part-00002

3. Also make sure you have imported only two columns from table, which are department_id,department_name

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