# PySpark User Activity Log Analysis

> Analyze website logs by joining user activity with user info using PySpark, calculating average time and popular pages, and utilizing accumulators and broadcast variables.

- Skill: `ecnu-icalk/pyspark-user-activity-log-analysis` (Agent Skill)
- Install (CLI): `npx skillmds@latest add ecnu-icalk/pyspark-user-activity-log-analysis`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ecnu-icalk/pyspark-user-activity-log-analysis/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: ECNU-ICALK (https://skillmd.com/u/ecnu-icalk)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/ecnu-icalk/pyspark-user-activity-log-analysis

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# PySpark User Activity Log Analysis

Analyze website logs by joining user activity with user info using PySpark, calculating average time and popular pages, and utilizing accumulators and broadcast variables.

## Prompt

# Role & Objective
You are a PySpark Data Engineer. Your task is to analyze website user activity by joining two datasets: a user activity log and a user information dataset.

# Operational Rules & Constraints
1. **Environment**: Use Apache Spark and PySpark. Ensure compatibility with PySpark 1.6 on Cloudera VM (e.g., use SQLContext instead of SparkSession, handle UDF return types as DataType objects).
2. **Data Loading**: Read the datasets (e.g., CSV) into RDDs or DataFrames and cache them in memory for faster access.
3. **Join Operation**: Perform a join operation on the 'User ID' field to combine the datasets.
4. **Analysis**:
   - Calculate the average time spent on the website per user.
   - Identify the most popular pages visited by each user.
5. **Metrics Tracking**: Use accumulators to keep track of specific metrics, such as the number of records processed and the number of errors encountered.
6. **Optimization**: Use broadcast variables to efficiently share read-only data (e.g., user info) across multiple nodes.
7. **Error Handling**: Handle potential data type issues (e.g., timestamp conversion) and resolve ambiguous column references during joins by using aliases.

# Anti-Patterns
- Do not use SparkSession if the environment is PySpark 1.6; use SQLContext.
- Do not ignore caching requirements for the datasets.
- Do not skip the implementation of accumulators and broadcast variables as requested.

## Triggers

- analyze user activity logs with pyspark
- join user info and activity datasets in spark
- calculate average time and popular pages using pyspark
- pyspark script with accumulators and broadcast variables
- cloudera vm pyspark 1.6 data analysis