CSE511-Assignment 5 Solved

The required task is to build a generic parallel sort and parallel join algorithm.

1.  Implement a Python function ParallelSort() that takes as input: (1) InputTable stored in a PostgreSQL database, (2) SortingColumnName the name of the column used to order the tuples by. ParallelSort() then sorts all tuples (using five parallelized threads) and stores the sorted tuples for in a table named OutputTable (the output table name is passed to the function). The OutputTable contains all the tuple present in InputTable sorted in ascending order.

For more information on Psycopg, click here.     (http://initd.org/psycopg/docs/)

Function Interface:

ParallelSort (InputTable, SortingColumnName, OutputTable, openconnection) InputTable – Name of the table on which sorting needs to be done.

SortingColumnName – Name of the column on which sorting needs to be done, would be either of type integer or real or float. Basically Numeric format. Will be Sorted in Ascending order.

OutputTable – Name of the table where the output needs to be stored. openconnection – connection to the database.

 

2.  Implement a Python function ParallelJoin() that takes as input: (1) InputTable1 and

InputTable2 table stored in a PostgreSQL database, (2) Table1JoinColumn and Table2JoinColumn that represent the join key in each input table respectively. ParallelJoin() then joins both InputTable1 and InputTable2 (using five parallelized threads) and stores the resulting joined tuples in a table named OutputTable (the output table name is passed to the function). The schema of OutputTable should be similar to the schema of both InputTable1 and InputTable2 combined.

 

Function Interface:

ParallelJoin (InputTable1, InputTable2, Table1JoinColumn, Table2JoinColumn,

OutputTable, openconnection)

InputTable1 – Name of the first table on which you need to perform join.

InputTable2 – Name of the second table on which you need to perform join.

Table1JoinColumn – Name of the column from first table i.e. join key for first table. Table2JoinColumn – Name of the column from second table i.e. join key for second table.

OutputTable - Name of the table where the output needs to be stored. openconnection – connection to the database.

Please use the function signature exactly same as mentioned in

Assignment3_Interface.py. You will notice that in top of Assignment3_Interface.py, following things are declared

Example
Let's use an example to understand how those functions are called.

FIRST_TABLE_NAME = 'table1'

SECOND_TABLE_NAME = 'table2'

SORT_COLUMN_NAME_FIRST_TABLE = 'column1'

SORT_COLUMN_NAME_SECOND_TABLE = 'column2'

JOIN_COLUMN_NAME_FIRST_TABLE = 'column1'

JOIN_COLUMN_NAME_SECOND_TABLE = 'column2'

Once your implementation is complete, you will have to create two tables in database manually. Name them MovieRating and MovieBoxOfficeCollection. Suppose, you want to sort MovieRating by column Rating and MovieBoxOfficeCollection by column Collection.

You also want to join MovieRating and MovieBoxOfficeCollection by column MovieID.

Then, you would define the variables mentioned above as : FIRST_TABLE_NAME =

'MovieRating'

SECOND_TABLE_NAME = 'MovieBoxOfficeCollection'

SORT_COLUMN_NAME_FIRST_TABLE = 'Rating'

SORT_COLUMN_NAME_SECOND_TABLE = 'Collection'

JOIN_COLUMN_NAME_FIRST_TABLE = 'MovieID'

JOIN_COLUMN_NAME_SECOND_TABLE = 'MovieID'

 

Naming Convention to be followed strictly:

Database name - dds_assignment

Postgres User name - postgres

Postgres password - 1234

 

Instructions on how this will be tested:

Please follow these instructions closely.

1.  Two tables will be created in the database manually.

2.  The created tables will contain at least an integer field, which would be used for bothParallel Sorting and Parallel Joining.

3.  Then, the ParallelSort() and ParallelJoin() Function will be called to check thecorrectness of the program.

4.  Your code should use 5 threads for both ParallelSort() as well as ParallelJoin().

5.  Your code should be able to handle table irrespective of its schema.

6.  Do not make your code dependent on any particular table; it should be able to work onany table.

 

Assignment Tips!

Please follow these instructions closely else marks will be deducted.

1.  Please follow the function signature as provided in the Assignment3_Interfacy.py.

2.  Please use the same database name, table name, user name and password asprovided in the assignment to keep it consistent.

3.  Please make sure to run the file before submitting and make sure there is noindentation error. In case of any compilation error, 0 marks will be given.

4.  Do not modify any function signature in Assignment3_Interface.py. In case anymodification is needed, please post the same on discussion board.