Processing Collections using Loops

As part of this class we have seen

• Overview of collections – List, Set and Map
• Basic operations on List
• Process collections using loops
• Process collections using filter and map

Reading orders and orderItems from file system

myTake function using loops

Get revenue for order id using loops

Exercises

• Get revenue for order id using loops. For each item subtotal can be computed by multiplying quantity (4th field) with price (6th field).
  • Path: /data/retail_db/order_items/part-00000
• Get count of complete orders
  • Path: /data/retail_db/orders/part-00000
• Get count of complete/closed orders that are placed in 2013 August

myFilter with invocations

Get revenue for order id using Map Reduce

Exercises

• Get revenue for order id using Map Reduce. For each item subtotal can be computed by multiplying quantity (4th field) with price (6th field).
  • Path: /data/retail_db/order_items/part-00000
• Get count of complete orders
  • Path: /data/retail_db/orders/part-00000
• Get count of complete/closed orders that are placed in 2013 August