CCA175 Exam Dumps : CCA Spark and Hadoop Developer Exam - Performance Based Scenarios

Solution : pairRDD1.fullOuterJoin(pairRDD2).collect

fullOuterJoin [Pair]

Performs the full outer join between two paired RDDs.

Listing Variants

def fullOuterJoin[W](other: RDD[(K, W)], numPartitions: Int): RDD[(K, (Option[V], OptionfW]))]

def fullOuterJoin[W](other: RDD[(K, W}]}: RDD[(K, (Option[V], OptionfW]))]

def fullOuterJoin[W](other: RDD[(K, W)], partitioner: Partitioner): RDD[(K, (Option[V], Option[W]))]

Solution:

Step 1 : Import Single table .

sqoop import --connect jdbc:mysql://quickstart:3306/retail_db -username=retail_dba -password=cloudera -table=orders --target-dir=p89_orders - -m1

sqoop import --connect jdbc:mysql://quickstart:3306/retail_db -username=retail_dba -password=cloudera -table=order_items ~target-dir=p89_ order items -m 1

Note : Please check you dont have space between before or after '=' sign. Sqoop uses the MapReduce framework to copy data from RDBMS to hdfs

Step 2 : Read the data from one of the partition, created using above command, hadoopfs -cat p89_orders/part-m-00000 hadoop fs -cat p89_order_items/part-m-00000

Step 3 : Load these above two directory as RDD using Spark and Python (Open pyspark terminal and do following). orders = sc.textFile("p89_orders") orderitems = sc.textFile("p89_order_items")

Step 4 : Convert RDD into key value as (orderjd as a key and rest of the values as a value)

#First value is orderjd

ordersKeyValue = orders.map(lambda line: (int(line.split(",")[0]), line))

#Second value as an Orderjd

orderltemsKeyValue = orderltems.map(lambda line: (int(line.split(",")[1]), line))

Step 5 : Join both the RDD using orderjd

joinedData = orderltemsKeyValue.join(ordersKeyValue)

#print the joined data

tor line in joinedData.collect():

print(line)

Format of joinedData as below.

[Orderld, 'All columns from orderltemsKeyValue', 'All columns from orders Key Value']

Step 6 : Now fetch selected values Orderld, Order date and amount collected on this order.

revenuePerOrderPerDay = joinedData.map(lambda row: (row[0]( row[1][1].split(",")[1]( f!oat(row[1][0].split('\M}[4]}}}

#printthe result

for line in revenuePerOrderPerDay.collect():

print(line)

Step 7 : Select distinct order ids for each date.

#distinct(date,order_id)

distinctOrdersDate = joinedData.map(lambda row: row[1][1].split('\")[1] + "," + str(row[0])).distinct()

for line in distinctOrdersDate.collect(): print(line)

Step 8 : Similar to word count, generate (date, 1) record for each row. newLineTuple = distinctOrdersDate.map(lambda line: (line.split(",")[0], 1))

Step 9 : Do the count for each key(date), to get total order per date. totalOrdersPerDate = newLineTuple.reduceByKey(lambda a, b: a + b}

#print results

for line in totalOrdersPerDate.collect():

print(line)

step 10 : Sort the results by date sortedData=totalOrdersPerDate.sortByKey().collect()

#print results

for line in sortedData:

print(line)

Solution :

Step 1 : Login to musql db

mysql --user=retail_dba -password=cloudera

show databases;

use retail db; show tables;

Step 2 : Create a table as given in problem statement.

CREATE table departments_new (department_id int(11), department_name varchar(45), createddate T1MESTAMP DEFAULT NOW());

show tables;

Step 3 : isert records from departments table to departments_new insert into departments_new select a.", null from departments a;

Step 4 : Import data from departments new table to hdfs.

sqoop import \

-connect jdbc:mysql://quickstart:330G/retail_db \

~username=retail_dba \

-password=cloudera \

-table departments_new\

--target-dir /user/cloudera/departments_new \

--split-by departments

Stpe 5 : Check the imported data.

hdfs dfs -cat /user/cloudera/departmentsnew/part"

Step 6 : Insert following 5 records in departmentsnew table.

Insert into departments_new values(110, "Civil" , null);

Insert into departments_new values(111, "Mechanical" , null);

Insert into departments_new values(112, "Automobile" , null);

Insert into departments_new values(113, "Pharma" , null);

Insert into departments_new values(114, "Social Engineering" , null);

commit;

Stpe 7 : Import incremetal data based on created_date column.

sqoop import \

-connect jdbc:mysql://quickstart:330G/retaiI_db \

-username=retail_dba \

-password=cloudera \

--table departments_new\

-target-dir /user/cloudera/departments_new \

-append \

-check-column created_date \

-incremental lastmodified \

-split-by departments \

-last-value "2016-01-30 12:07:37.0"

Step 8 : Check the imported value.

hdfs dfs -cat /user/cloudera/departmentsnew/part"