Solution :

Step 1 : Import Single table .

sqoop import --connect jdbc:mysql://quickstart:3306/retail_db -username=retail_dba -password=cloudera -table=products -target-dir=p93_products -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 : Step 2 : Read the data from one of the partition, created using above command, hadoop fs -cat p93_products/part-m-00000

Step 3 : Load this directory as RDD using Spark and Python (Open pyspark terminal and do following). productsRDD = sc.textFile("p93_products")

Step 4 : Filter empty prices, if exists

#filter out empty prices lines

nonemptyjines = productsRDD.filter(lambda x: len(x.split(",")[4]) > 0)

Step 5 : Now sort data based on product_price in order. sortedPriceProducts=nonempty_lines.map(lambdaline:(float(line.split(",")[4]),line.split(",")[2])).sortByKey()

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

Step 6 : Now sort data based on product_price in descending order. sortedPriceProducts=nonempty_lines.map(lambda line: (float(line.split(",")[4]),line.split(",")[2])).sortByKey(False)

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

Step 7 : Get highest price products name. sortedPriceProducts=nonemptyJines.map(lambda line : (float(line.split(",")[4]),line-split(,,,,,)[2]))-sortByKey(False).take(1)

print(sortedPriceProducts)

Step 8 : Now sort data based on product_price as well as product_id in descending order.

#Dont forget to cast string #Tuple as key ((price,id),name)

sortedPriceProducts=nonemptyJines.map(lambda line : ((float(line print(sortedPriceProducts)

Step 9 : Now sort data based on product_price as well as product_id in descending order, using top() function.

#Dont forget to cast string

#Tuple as key ((price,id),name)

sortedPriceProducts=nonemptyJines.map(lambda line: ((float(line.s^^

print(sortedPriceProducts)

Step 10 : Now sort data based on product_price as ascending and product_id in ascending order, using takeOrdered{) function.

#Dont forget to cast string

#Tuple as key ((price,id),name) sortedPriceProducts=nonemptyJines.map(lambda line: ((float(line.split(","}[4]},int(line.split(","}[0]}},line.split(","}[2]}}.takeOrdered(10, lambda tuple : (tuple[0][0],tuple[0][1]))

Step 11 : Now sort data based on product_price as descending and product_id in ascending order, using takeOrdered() function.

#Dont forget to cast string

#Tuple as key ((price,id},name)

#Using minus(-) parameter can help you to make descending ordering , only for numeric value.

sortedPrlceProducts=nonemptylines.map(lambda line: ((float(line.split(","}[4]},int(line.split(","}[0]}},line.split(","}[2]}}.takeOrdered(10, lambda tuple : (-tuple[0][0],tuple[0][1]}}

Solution :

Step 1 : Create a csv tile named updateddepartments.csv with give content.

Step 2 : Now upload this tile to HDFS.

Create a directory called newdata.

hdfs dfs -mkdir new_data

hdfs dfs -put updated_departments.csv newdata/

Step 3 : Check whether tile is uploaded or not. hdfs dfs -Is new_data

Step 4 : Export this file to departments table using sqoop.

sqoop export --connect jdbc:mysql://quickstart:3306/retail_db \

-username retail_dba \

--password cloudera \

-table departments \

--export-dir new_data \

-batch \

-m 1 \

-update-key department_id \

-update-mode allowinsert

Step 5 : Check whether required data upsert is done or not. mysql --user=retail_dba -password=cloudera

show databases;

use retail_db;

show tables;

select" from departments;

Step 6 : Update updated_departments.csv file.

Step 7 : Override the existing file in hdfs.

hdfs dfs -put updated_departments.csv newdata/

Step 8 : Now do the Sqoop export as per the requirement.

sqoop export --connect jdbc:mysql://quickstart:3306/retail_db \

-username retail_dba\

--password cloudera \

--table departments \

--export-dir new_data \

--batch \

-m 1 \

--update-key-department_id \

-update-mode updateonly

Step 9 : Check whether required data update is done or not. mysql --user=retail_dba -password=cloudera

show databases;

use retail db;

show tables;

select" from departments;

Solution :

b.reduceByKey(_ + _).collect

reduceByKey JPair] : This function provides the well-known reduce functionality in Spark. Please note that any function f you provide, should be commutative in order to generate reproducible results.

Solution :

Step 1 : Select all the products which has product code as null

val results = sqlContext.sql(......SELECT' FROM products WHERE code IS NULL......)

results. showQ

val results = sqlContext.sql(......SELECT * FROM products WHERE code = NULL ",,M )

results.showQ

Step 2 : Select all the products , whose name starts with Pen and results should be order by Price descending order. val results = sqlContext.sql(......SELECT * FROM products WHERE name LIKE 'Pen %' ORDER BY price DESC......)

results. showQ

Step 3 : Select all the products , whose name starts with Pen and results should be order by Price descending order and quantity ascending order. val results = sqlContext.sql('.....SELECT * FROM products WHERE name LIKE 'Pen %' ORDER BY price DESC, quantity......)

results. showQ

Step 4 : Select top 2 products by price

val results = sqlContext.sql(......SELECT' FROM products ORDER BY price desc LIMIT2......}

results. show()

Solution :

Step 1 : Create hive table as below.

hive

show tables;

create table departments_hive01(department_id int, department_name string, avgsalary int);

Step 2 : Create table in mysql db as well.

mysql -user=retail_dba -password=cloudera

use retail_db

CREATE TABLE IF NOT EXISTS departments_hive01(id int, department_name varchar(45), avg_salary int);

show tables;

step 3 : Insert data in mysql table.

insert into departments_hive01 select a.*, null from departments a;

check data inserts

select' from departments_hive01;

Now iserts null records as given in problem. insert into departments_hive01 values(777, "Not known",1000); insert into departments_hive01 values(8888, null,1000); insert into departments_hive01 values(666, null,1100);

Step 4 : Now import data in hive as per requirement.

sqoop import \

-connect jdbc:mysql://quickstart:3306/retail_db \

~username=retail_dba \

--password=cloudera \

-table departments_hive01 \

--hive-home /user/hive/warehouse \

--hive-import \

-hive-overwrite \

-hive-table departments_hive0l \

--fields-terminated-by '\001' \

--null-string M"\

--null-non-strlng -999 \

-split-by id \

-m 1

Step 5 : Checkthe data in directory.

hdfs dfs -Is /user/hive/warehouse/departments_hive01

hdfs dfs -cat/user/hive/warehouse/departments_hive01/part"

Check data in hive table.

Select * from departments_hive01;

Solution : c.sortByKey(false).collect

sortByKey [Ordered] : This function sorts the input RDD's data and stores it in a new RDD. "The output RDD is a shuffled RDD because it stores data that is output by a reducer which has been shuffled. The implementation of this function is actually very clever. First, it uses a range partitioner to partition the data in ranges within the shuffled RDD.

Then it sorts these ranges individually with mapPartitions using standard sort mechanisms.

Solution :

Step 1 : create employee.json tile locally.

vi employee.json (press insert) past the content.

Step 2 : Upload this tile to hdfs, default location hadoop fs -put employee.json

val employee = sqlContext.read.json("/user/cloudera/employee.json")

employee.write.parquet("employee. parquet")

val parq_data = sqlContext.read.parquet("employee.parquet")

parq_data.registerTempTable("employee")

val allemployee = sqlContext.sql("SELeCT' FROM employee")

all_employee.show()

import org.apache.spark.sql.SaveMode prdDF.write..format("orc").saveAsTable("product ore table"}

//Change the codec.

sqlContext.setConf("spark.sql.parquet.compression.codec","snappy")

employee.write.mode(SaveMode.Overwrite).parquet("employee.parquet")