Problem Scenario 1:
You have been given MySQL DB with following details.
user=retail_dba
password=cloudera
database=retail_db
table=retail_db.categories
jdbc URL = jdbc:mysql://quickstart:3306/retail_db
Please accomplish following activities.
1. Connect MySQL DB and check the content of the tables.
2. Copy "retaildb.categories" table to hdfs, without specifying directory name.
3. Copy "retaildb.categories" table to hdfs, in a directory name "categories_target".
4. Copy "retaildb.categories" table to hdfs, in a warehouse directory name "categories_warehouse".
Answer:
Solution :
Step 1 : Connecting to existing MySQL Database mysql - - user=retail_dba - - password=cloudera
retail_db
Step 2 : Show all the available tables show tables;
Step 3 : View/Count data from a table in MySQL select count(1} from categories;
Step 4 : Check the currently available data in HDFS directory hdfs dfs - Is
Step 5 : Import Single table (Without specifying directory).
sqoop import - - connect jdbc:mysql://quickstart:3306/retail_db - username=retail_dba -
password=cloudera - table=categories
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 6 : Read the data from one of the partition, created using above command, hdfs dfs -
catxategories/part - m - 00000
Step 7 : Specifying target directory in import command (We are using number of mappers =1, you
can change accordingly) sqoop import - connect jdbc:mysql://quickstart:3306/retail_db -
username=retail_dba - password=cloudera ~table=categories - target - dir=categortes_target - - m 1
Step 8 : Check the content in one of the partition file.
hdfs dfs - cat categories_target/part - m - 00000
Step 9 : Specifying parent directory so that you can copy more than one table in a specified target
directory. Command to specify warehouse directory.
sqoop import - . - connect jdbc:mysql://quickstart:3306/retail_db - - username=retail dba -
password=cloudera - table=categories - warehouse - dir=categories_warehouse - - m 1
Question# 2
Problem Scenario 2 :
There is a parent organization called "ABC Group Inc", which has two child companies named Tech
Inc and MPTech.
Both companies employee information is given in two separate text file as below. Please do the
following activity for employee details.
Tech Inc.txt
1,Alok,Hyderabad
2,Krish,Hongkong
3,Jyoti,Mumbai
4,Atul,Banglore
5,Ishan,Gurgaon
MPTech.txt
6,John,Newyork
7,alp2004,California
8,tellme,Mumbai
9,Gagan21,Pune
10,Mukesh,Chennai
1. Which command will you use to check all the available command line options on HDFS and How
will you get the Help for individual command.
2. Create a new Empty Directory named Employee using Command line. And also create an empty
file named in it Techinc.txt
3. Load both companies Employee data in Employee directory (How to override existing file in HDFS).
4. Merge both the Employees data in a Single tile called MergedEmployee.txt, merged tiles should
have new line character at the end of each file content.
5. Upload merged file on HDFS and change the file permission on HDFS merged file,so that owner
and group member can read and write, other user can read the file.
6. Write a command to export the individual file as well as entire directory from HDFS to local file
System.
Answer:
Solution :
Step 1 : Check All Available command hdfs dfs
Step 2 : Get help on Individual command hdfs dfs - help get
Step 3 : Create a directory in HDFS using named Employee and create a Dummy file in it called e.g.
Techinc.txt hdfs dfs - mkdir Employee
Now create an emplty file in Employee directory using Hue.
Step 4 : Create a directory on Local file System and then Create two files, with the given data in
problems.
Step 5 : Now we have an existing directory with content in it, now using HDFS command line , overrid
this existing Employee directory. While copying these files from local file System to HDFS. cd
/home/cloudera/Desktop/ hdfs dfs - put - f Employee
Step 6 : Check All files in directory copied successfully hdfs dfs - Is Employee
Step 7 : Now merge all the files in Employee directory, hdfs dfs - getmerge - nl Employee
MergedEmployee.txt
Step 8 : Check the content of the file. cat MergedEmployee.txt
Step 9 : Copy merged file in Employeed directory from local file ssytem to HDFS. hdfs dfs - put
MergedEmployee.txt Employee/
Step 10 : Check file copied or not. hdfs dfs - Is Employee
Step 11 : Change the permission of the merged file on HDFS hdfs dfs - chmpd 664
Employee/MergedEmployee.txt
Step 12 : Get the file from HDFS to local file system, hdfs dfs - get Employee Employee_hdfs
Question# 3
Problem Scenario 3: You have been given MySQL DB with following details.
user=retail_dba
password=cloudera
database=retail_db
table=retail_db.categories
jdbc URL = jdbc:mysql://quickstart:3306/retail_db
Please accomplish following activities.
1. Import data from categories table, where category=22 (Data should be stored in categories
subset)
2. Import data from categories table, where category>22 (Data should be stored in
categories_subset_2)
3. Import data from categories table, where category between 1 and 22 (Data should be stored in
categories_subset_3)
4. While importing catagories data change the delimiter to '|' (Data should be stored in
categories_subset_S)
5. Importing data from catagories table and restrict the import to category_name,category id
columns only with delimiter as '|'
6. Add null values in the table using below SQL statement ALTER TABLE categories modify
category_department_id int(11); INSERT INTO categories values (eO.NULL.'TESTING');
7. Importing data from catagories table (In categories_subset_17 directory) using '|' delimiter and
categoryjd between 1 and 61 and encode null values for both string and non string columns.
8. Import entire schema retail_db in a directory categories_subset_all_tables
Answer:
Solution:
Step 1: Import Single table (Subset data} Note: Here the ' is the same you find on - key
sqoop import - - connect jdbc:mysql://quickstart:3306/retail_db - - username=retail_dba -
password=cloudera - table=categories ~warehouse - dir=categories_subset - - where \'category_id\’=22
- - m 1
Step 2 : Check the output partition
hdfs dfs - cat categoriessubset/categories/part - m - 00000
Step 3 : Change the selection criteria (Subset data)
sqoop import - - connect jdbc:mysql://quickstart:3306/retail_db - - username=retail_dba -
password=cloudera - table=categories ~warehouse - dir=categories_subset_2 - - where
\’category_id\’\>22 - m 1
Step 4 : Check the output partition
hdfs dfs - cat categories_subset_2/categories/part - m - 00000
Step 5 : Use between clause (Subset data)
sqoop import - - connect jdbc:mysql://quickstart:3306/retail_db - - username=retail_dba -
password=cloudera - table=categories ~warehouse - dir=categories_subset_3 - - where "\’category_id\'
between 1 and 22" - - m 1
Step 6 : Check the output partition
hdfs dfs - cat categories_subset_3/categories/part - m - 00000
Step 7 : Changing the delimiter during import.
sqoop import - - connect jdbc:mysql://quickstart:3306/retail_db - - username=retail dba -
password=cloudera - table=categories - warehouse - dir=:categories_subset_6 - - where "/’categoryjd /’
between 1 and 22" - fields - terminated - by='|' - m 1
Step 8 : Check the.output partition
hdfs dfs - cat categories_subset_6/categories/part - m - 00000
Step 9 : Selecting subset columns
sqoop import - - connect jdbc:mysql://quickstart:3306/retail_db - - username=retail_dba -
password=cloudera - table=categories - - warehouse - dir=categories subset col - where "/’category id/’
between 1 and 22" - fields - terminated - by=T - columns=category name,category id - - m 1
Step 10 : Check the output partition
hdfs dfs - cat categories_subset_col/categories/part - m - 00000
Step 11 : Inserting record with null values (Using mysql} ALTER TABLE categories modify
category_department_id int(11); INSERT INTO categories values ^NULL/TESTING'); select" from
categories;
Step 12 : Encode non string null column
sqoop import - - connect jdbc:mysql://quickstart:3306/retail_db - - username=retail dba -
password=cloudera - table=categories - - warehouse - dir=categortes_subset_17 - where
"\"category_id\" between 1 and 61" - fields - terminated - by=,|' - - null - string - N' - null - non - string=,N' - - m
1
Step 13 : View the content
hdfs dfs - cat categories_subset_17/categories/part - m - 00000
Step 14 : Import all the tables from a schema (This step will take little time)
sqoop import - all - tables - connect jdbc:mysql://quickstart:3306/retail_db - - username=retail_dba -
password=cloudera - warehouse - dir=categories_si
Step 15 : View the contents
hdfs dfs - Is categories_subset_all_tables
Step 16 : Cleanup or back to originals.
delete from categories where categoryid in (59,60);
ALTER TABLE categories modify category_department_id int(11) NOTNULL;
ALTER TABLE categories modify category_name varchar(45) NOT NULL;
desc categories;
Question# 4
Problem Scenario 4: You have been given MySQL DB with following details.
user=retail_dba
password=cloudera
database=retail_db
table=retail_db.categories
jdbc URL = jdbc:mysql://quickstart:3306/retail_db
Please accomplish following activities.
Import Single table categories(Subset data} to hive managed table , where category_id between 1
and 22
Answer:
Solution :
Step 1 : Import Single table (Subset data)
sqoop import - - connect jdbc:mysql://quickstart:3306/retail_db - username=retail_dba -
password=cloudera - table=categories - where " \’category_id \’ between 1 and 22" - - hive - import - - m 1
Note: Here the ' is the same you find on ~ key
This command will create a managed table and content will be created in the following directory.
/user/hive/warehouse/categories
Step 2 : Check whether table is created or not (In Hive)
show tables;
select * from categories;
Question# 5
Problem Scenario 5 : You have been given following mysql database details.
user=retail_dba
password=cloudera
database=retail_db
jdbc URL = jdbc:mysql://quickstart:3306/retail_db
Please accomplish following activities.
1. List all the tables using sqoop command from retail_db
2. Write simple sqoop eval command to check whether you have permission to read database tables
or not.
3. Import all the tables as avro files in /user/hive/warehouse/retail cca174.db
4. Import departments table as a text file in /user/cloudera/departments.
Answer:
Solution:
Step 1 : List tables using sqoop
sqoop list - tables - - connect jdbc:mysql://quickstart:330G/retail_db - - username retail dba - password
cloudera
Step 2 : Eval command, just run a count query on one of the table.
sqoop eval \
- - connect jdbc:mysql://quickstart:3306/retail_db \
- username retail_dba \
- password cloudera \
- - query "select count(1) from ordeMtems"
Step 3 : Import all the tables as avro file.
sqoop import - all - tables \
- connect jdbc:mysql://quickstart:3306/retail_db \
- username=retail_dba \
- password=cloudera \
- as - avrodatafile \
- warehouse - dir=/user/hive/warehouse/retail stage.db \
- ml
Step 4 : Import departments table as a text file in /user/cloudera/departments
sqoop import \
- connect jdbc:mysql://quickstart:3306/retail_db \
- username=retail_dba \
- password=cloudera \
- table departments \
- as - textfile \
- target - dir=/user/cloudera/departments
Step 5 : Verify the imported data.
hdfs dfs - Is /user/cloudera/departments
hdfs dfs - Is /user/hive/warehouse/retailstage.db
hdfs dfs - Is /user/hive/warehouse/retail_stage.db/products
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