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Cloudera CCA175 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Data Ingestion and ETL | - Data transformation
|
| Topic 2: Data Analysis with Hive and Impala | - Impala performance querying
|
| Topic 3: Data Processing with Apache Spark | - Spark SQL
|
| Topic 4: Data Storage and File Systems | - HDFS fundamentals
|
CCA175 Exam Details and Candidate Protections
Cloudera specifies the following prerequisites for the Cloudera CCA Spark and Hadoop Developer: No strict prerequisites, but strong familiarity with Hadoop ecosystem, SQL, and programming in Python or Scala is recommended..
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As of the latest information, the passing score for the CCA175 exam is 70% and the fee is $295 USD. Cloudera sets both, so verify the current figures on the official site before scheduling.
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The Cloudera CCA Spark and Hadoop Developer blueprint centers on these principal domains:
- Data Storage and File Systems
- Data Processing with Apache Spark
- Data Ingestion and ETL
Further domains complete the official outline, and our question bank spans every one.
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According to the latest exam information, the CCA175 exam includes 12-15 performance-based tasks questions and lasts 120 minutes minutes. Practicing under the same limit builds the pacing confidence you will want on the day.
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Cloudera CCA Spark and Hadoop Developer Sample Questions:
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Problem Scenario 15 : 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 activities.
1. In mysql departments table please insert following record. Insert into departments values(9999, '"Data Science"1);
2. Now there is a downstream system which will process dumps of this file. However, system is designed the way that it can process only files if fields are enlcosed in(') single quote and separate of the field should be (-} and line needs to be terminated by : (colon).
3. If data itself contains the " (double quote } than it should be escaped by \.
4. Please import the departments table in a directory called departments_enclosedby and file should be able to process by downstream system.
Correct Answer:
See the explanation for Step by Step Solution and configuration.
Explanation:
Solution :
Step 1 : Connect to mysql database.
mysql --user=retail_dba -password=cloudera
show databases; use retail_db; show tables;
Insert record
Insert into departments values(9999, '"Data Science"');
select" from departments;
Step 2 : Import data as per requirement.
sqoop import \
-connect jdbc:mysql;//quickstart:3306/retail_db \
~ username=retail_dba \
--password=cloudera \
-table departments \
-target-dir /user/cloudera/departments_enclosedby \
-enclosed-by V -escaped-by \\ -fields-terminated-by--' -lines-terminated-by :
Step 3 : Check the result.
hdfs dfs -cat/user/cloudera/departments_enclosedby/part"
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Problem Scenario 25 : You have been given below comma separated employee information. That needs to be added in /home/cloudera/flumetest/in.txt file (to do tail source) sex,name,city
1 ,alok,mumbai
1 ,jatin,chennai
1 ,yogesh,kolkata
2 ,ragini,delhi
2 ,jyotsana,pune
1,valmiki,banglore
Create a flume conf file using fastest non-durable channel, which write data in hive warehouse directory, in two separate tables called flumemaleemployee1 and flumefemaleemployee1
(Create hive table as well for given data}. Please use tail source with
/home/cloudera/flumetest/in.txt file.
Flumemaleemployee1 : will contain only male employees data flumefemaleemployee1 :
Will contain only woman employees data
Correct Answer:
See the explanation for Step by Step Solution and configuration.
Explanation:
Solution :
Step 1 : Create hive table for flumemaleemployeel and .'
CREATE TABLE flumemaleemployeel
(
sex_type int, name string, city string )
ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';
CREATE TABLE flumefemaleemployeel
(
sex_type int, name string, city string
)
ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';
Step 2 : Create below directory and file mkdir /home/cloudera/flumetest/ cd
/home/cloudera/flumetest/
Step 3 : Create flume configuration file, with below configuration for source, sink and channel and save it in flume5.conf.
agent.sources = tailsrc
agent.channels = mem1 mem2
agent.sinks = stdl std2
agent.sources.tailsrc.type = exec
agent.sources.tailsrc.command = tail -F /home/cloudera/flumetest/in.txt agent.sources.tailsrc.batchSize = 1 agent.sources.tailsrc.interceptors = i1 agent.sources.tailsrc.interceptors.i1.type = regex_extractor agent.sources.tailsrc.interceptors.il.regex = A(\\d} agent.sources.tailsrc.
interceptors. M.serializers = t1 agent.sources.tailsrc. interceptors, i1.serializers.t1. name = type agent.sources.tailsrc.selector.type = multiplexing agent.sources.tailsrc.selector.header = type agent.sources.tailsrc.selector.mapping.1 = memi agent.sources.tailsrc.selector.mapping.2 = mem2 agent.sinks.std1.type = hdfs
agent.sinks.stdl.channel = mem1
agent.sinks.stdl.batchSize = 1
agent.sinks.std1.hdfs.path = /user/hive/warehouse/flumemaleemployeei
agent.sinks.stdl.rolllnterval = 0
agent.sinks.stdl.hdfs.tileType = Data Stream
agent.sinks.std2.type = hdfs
agent.sinks.std2.channel = mem2
agent.sinks.std2.batchSize = 1
agent.sinks.std2.hdfs.path = /user/hi ve/warehouse/fIumefemaleemployee1 agent.sinks.std2.rolllnterval = 0 agent.sinks.std2.hdfs.tileType = Data Stream agent.channels.mem1.type = memory agent.channels.meml.capacity = 100
agent.channels.mem2.type = memory agent.channels.mem2.capacity = 100
agent.sources.tailsrc.channels = mem1 mem2
Step 4 : Run below command which will use this configuration file and append data in hdfs.
Start flume service:
flume-ng agent -conf /home/cloudera/flumeconf -conf-file
/home/cloudera/fIumeconf/flume5.conf --name agent
Step 5 : Open another terminal create a file at /home/cloudera/flumetest/in.txt.
Step 6 : Enter below data in file and save it.
l.alok.mumbai
1 jatin.chennai
1 ,yogesh,kolkata
2 ,ragini,delhi
2 ,jyotsana,pune
1,valmiki,banglore
Step 7 : Open hue and check the data is available in hive table or not.
Step 8 : Stop flume service by pressing ctrl+c
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Problem Scenario 59 : You have been given below code snippet.
val x = sc.parallelize(1 to 20)
val y = sc.parallelize(10 to 30) operationl
z.collect
Write a correct code snippet for operationl which will produce desired output, shown below.
Array[lnt] = Array(16,12, 20,13,17,14,18,10,19,15,11)
Correct Answer:
See the explanation for Step by Step Solution and configuration.
Explanation:
Solution :
val z = x.intersection(y)
intersection : Returns the elements in the two RDDs which are the same.
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Problem Scenario 61 : You have been given below code snippet.
val a = sc.parallelize(List("dog", "salmon", "salmon", "rat", "elephant"), 3) val b = a.keyBy(_.length) val c = sc.parallelize(List("dog","cat","gnu","salmon","rabbit","turkey","wolf","bear","bee"), 3) val d = c.keyBy(_.length) operationl
Write a correct code snippet for operationl which will produce desired output, shown below.
Array[(lnt, (String, Option[String]}}] = Array((6,(salmon,Some(salmon))),
(6,(salmon,Some(rabbit))),
(6,(salmon,Some(turkey))), (6,(salmon,Some(salmon))), (6,(salmon,Some(rabbit))),
(6,(salmon,Some(turkey))), (3,(dog,Some(dog))), (3,(dog,Some(cat))),
(3,(dog,Some(dog))), (3,(dog,Some(bee))), (3,(rat,Some(dogg)), (3,(rat,Some(cat)j),
(3,(rat.Some(gnu))). (3,(rat,Some(bee))), (8,(elephant,None)))
Correct Answer:
See the explanation for Step by Step Solution and configuration.
Explanation:
Solution :
b.leftOuterJoin(d}.collect
leftOuterJoin [Pair]: Performs an left outer join using two key-value RDDs. Please note that the keys must be generally comparable to make this work keyBy : Constructs two- component tuples (key-value pairs) by applying a function on each data item. Trie result of the function becomes the key and the original data item becomes the value of the newly created tuples.
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Problem Scenario 44 : You have been given 4 files , with the content as given below:
spark11/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 spark11/file2.txt
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.
spark11/file3.txt
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 spark11/file4.txt
Apache Storm is focused on stream processing or what some call complex event processing. Storm implements a fault tolerant method for performing a computation or pipelining multiple computations on an event as it flows into a system. One might use
Storm to transform unstructured data as it flows into a system into a desired format
(spark11Afile1.txt)
(spark11/file2.txt)
(spark11/file3.txt)
(sparkl 1/file4.txt)
Write a Spark program, which will give you the highest occurring words in each file. With their file name and highest occurring words.
Correct Answer:
See the explanation for Step by Step Solution and configuration.
Explanation:
Solution :
Step 1 : Create all 4 file first using Hue in hdfs.
Step 2 : Load all file as an RDD
val file1 = sc.textFile("sparkl1/filel.txt")
val file2 = sc.textFile("spark11/file2.txt")
val file3 = sc.textFile("spark11/file3.txt")
val file4 = sc.textFile("spark11/file4.txt")
Step 3 : Now do the word count for each file and sort in reverse order of count.
val contentl = filel.flatMap( line => line.split(" ")).map(word => (word,1)).reduceByKey(_ +
_).map(item => item.swap).sortByKey(false).map(e=>e.swap)
val content.2 = file2.flatMap( line => line.splitf ")).map(word => (word,1)).reduceByKey(_
+ _).map(item => item.swap).sortByKey(false).map(e=>e.swap)
val content3 = file3.flatMap( line > line.split)" ")).map(word => (word,1)).reduceByKey(_
+ _).map(item => item.swap).sortByKey(false).map(e=>e.swap)
val content4 = file4.flatMap( line => line.split(" ")).map(word => (word,1)).reduceByKey(_ +
_ ).map(item => item.swap).sortByKey(false).map(e=>e.swap)
Step 4 : Split the data and create RDD of all Employee objects.
val filelword = sc.makeRDD(Array(file1.name+"->"+content1(0)._1+"-"+content1(0)._2)) val file2word = sc.makeRDD(Array(file2.name+"->"+content2(0)._1+"-"+content2(0)._2)) val file3word = sc.makeRDD(Array(file3.name+"->"+content3(0)._1+"-"+content3(0)._2)) val file4word = sc.makeRDD(Array(file4.name+M->"+content4(0)._1+"-"+content4(0)._2))
Step 5: Union all the RDDS
val unionRDDs = filelword.union(file2word).union(file3word).union(file4word)
Step 6 : Save the results in a text file as below.
unionRDDs.repartition(1).saveAsTextFile("spark11/union.txt")
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