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Write code to upload Parquet files to an S3 bucket using boto3

Cloud/Toolseasy0.2 min readPremium

**Simple**: s3.upload_file('data.parquet', 'my-bucket', 'path/data.parquet')—handles multipart for >8MB. **From DataFrame**: df.to_parquet('s3://bucket/path/', engine='pyarrow') with s3fs. **Programmatic**: pyarrow read_table, write to BytesIO,...

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Frequency
Low
Asked at 1 company
Category
179
questions in Cloud/Tools
Difficulty Split
104E|27M|48H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Walmart

Why This Question Matters

This easy-level Cloud/Tools question appears frequently in data engineering interviews at companies like Walmart. While less common, it tests deeper understanding that distinguishes strong candidates.

How to Approach This

Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.

Expert Answer
46 words

Simple: s3.upload_file('data.parquet', 'my-bucket', 'path/data.parquet')—handles multipart for >8MB. From DataFrame: df.to_parquet('s3://bucket/path/', engine='pyarrow') with s3fs. Programmatic: pyarrow read_table, write to BytesIO, s3.put_object(Body=buffer.getvalue()). Large files: upload_file does multipart automatically; for >5GB, configure multipart threshold. Encryption: put_object(ServerSideEncryption='aws:kms'). Best practice: Use s3fs with pandas for simple; enable encryption; checksum for integrity.

The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations covering performance optimization and real-world examples.

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According to DataEngPrep.tech, this is one of the most frequently asked Cloud/Tools interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.

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