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Databricks Spark Optimizations: User-Defined vs. Databricks-Provided
Databricks optimizations include user-defined techniques like partitioning and caching, and Databricks-provided features like Catalyst and Delta optimizations.
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PySpark Storage Levels: Choosing the Right One for Optimal Performance
Learn about different storage levels in PySpark and choose the right one for optimal performance and resource utilization. Storage Levels in PySpark Here’s a comparison of MEMORY_AND_DISK with other storage levels: MEMORY_ONLY: MEMORY_ONLY_SER: MEMORY_AND_DISK: MEMORY_AND_DISK_SER: DISK_ONLY: OFF_HEAP: Key Considerations Choose the appropriate storage level based on your data size. Consider your access pattern and available…
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Mastering PySpark select() Method: Advanced Column Operations
In PySpark, the select() is used to select specific columns from a DataFrame. It allows you to perform various operations on the columns, including renaming them, applying functions, and more. Here’s a breakdown of how you can use it, and the methods/functions that can be applied within it. Basic Usage of the select() Functions and…
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PySpark DataFrame: Counting NULL Values in Each Column
To count the number of NULL values in each column of a PySpark DataFrame, you can use the isNull() function. Use this function with the agg method to compute the counts. PySpark’s isNull() method checks for NULL values, and then you can aggregate these checks to count them. Counting NULL Values in Each Column Let’s…
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PySpark DataFrame: Common Operations Cheat Sheet
In PySpark, many methods are directly available on DataFrame objects and other classes, so no separate import is needed. Here’s a cheat sheet of common PySpark methods. 1. DataFrame Methods These methods are directly available on DataFrame objects: 2. Spark Session Methods These methods are directly available on the SparkSession object: 3. RDD Methods If…
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Parquet vs ORC vs Avro: Top Differences Explained
This content compares the performance and features of three data formats: Parquet, ORC, and AVRO. Parquet and ORC are columnar formats optimizing storage and query performance, while AVRO is row-oriented, supporting schema evolution for varied workloads. Each format is suited for specific big data applications, emphasizing efficiency and compatibility.
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AWS Step Functions and AWS Glue Job Workflow Configuration
Here’s how you can set up an architecture. An Amazon S3 file upload triggers an AWS Lambda function via Amazon EventBridge (formerly known as CloudWatch Events). This function then starts an AWS Step Function workflow. This workflow triggers an AWS Glue job. Step-by-Step Overview Step 1: Configure S3 Bucket to Emit Events Step 2: Configure…
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AWS: 3 Easy to Write Lambda Functions
Here are three examples of AWS Lambda functions for different use cases. These include the hello world function, image resizing, and fetching data from DynamoDB. 1. Basic Hello World Function This is a simple AWS Lambda function that returns a “Hello, World!” message. It’s often used in the AWS Lambda to understand the basics. def lambda_handler(event, context): return { ‘statusCode’:…
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How to Delete Source Object After Glue Job Run Complete
Deleting S3 objects post-Glue job streamlines data management, frees up space, and maintains a clean dataset for analysis.
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CSV Column Validation Using PySpark: Step-by-Step Guide
The Python code demonstrates CSV file validation using PySpark. Validation rules are applied to columns, and the resulting dataframes are written to S3 and PgSQL.
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20 Python Pandas Interview Questions and Answers
Pandas is a data manipulation library for Python, offering Series, DataFrame, CSV, merging, grouping, and visualization capabilities.
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Group By Vs Partition By: Here’s the Right Answer
SQL uses GROUP BY to aggregate data into summary rows, while PARTITION BY aids window functions in dividing result sets.
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