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SalesInsights Data Pipeline

Project Overview

An e-commerce industry wants to gain real-time insights from the events log data to understand the sales and also want to store data on-premise in efficient manner for future batch processing and to build ML models. This project requires us to build a data pipeline that can serve business requirements.

Dataset

This dataset consists of events data for 5 months (Oct 2019-Feb 2020) in .csv format from a medium cosmetics online store. You can find the dataset here.
It has following attributes

  • event_time (in UTC)
  • event_type
    • view
    • cart
    • removefromcart
    • purchase
  • product_id
  • category_id
  • category_code
  • brand
  • price
  • user_id
  • user_session

Business Logic

  1. visualize sales data per product within 30 to 45 seconds once the payment is done.
  2. calculate customer lifetime value.

Data Pipeline

data pipeline

Project Development

Data Ingestion

  • In this stage, stimulated real time scenario by split the dataset to each day and adding to input folder for ingestion each minute using scripts. In real world we can have many input sources in different format with variable records/sec, I have taken one such case to develop the pipeline.
  • Used File-pluse kafka connect to ingest the from input folder to kafka topic for each new file in the folder.
  • To serialize the data, I have used JsonConverter.
    Note: We can also use Avro format to serialize our data, which supports schema evolution for changing dimensions. Confluent kafka platform provides us with schema registry, which helps in maintaining our schema with versions.

Stream Processing

  • In this stage, Spark structured streaming was used to process the data with necessary business logic transformations and filters.
  • Used watermark with stationary state to get the business requirements.
  • Archived processed data to on-prem cluster for batch processing and ML models.
    Note: We can further use Arbitrary Stateful Processing for maintaining user sessions of an undetermined amount of time and save those to perform some analysis on later to know abandonment cart after product was added to cart to increase sales. Its only available in scala.

Aggregation

  • Aggregated data with window and product_id from processing stage is pushed back to kafka topic; to be consumed by various applications.

Integration

  • Rocket, real-time analytics platform is used to integrate kafka with tableau for real-time insights and querying the data.
  • Rocket stores the each record as a documents in collections and provides us with low latency aggregations and joins.

Sales per Product Snapshot

sales snapshot

Note: Main focus was understanding the tools and their integration to build pipeline for end requirement. We can come up with many business requirements and anlaysis with this use case.

References