# Parquet Content-Defined Chunking

DevFeed: [Parquet Content-Defined Chunking](<https://devfeed.tech/articles/parquet-content-defined-chunking-7438.md>)

Original publisher: [Read original article](<https://huggingface.co/blog/parquet-cdc>)

Author: Krisztian Szucs

Published: 2025-07-25T00:00:00Z

Content type: article

Language: en

Sources: [Hugging Face - Blog](<https://devfeed.tech/sources/hugging-face-blog.md>)

Topics: [parquet](<https://devfeed.tech/topics/parquet.md>), [content defined chunking](<https://devfeed.tech/topics/content-defined-chunking.md>), [xet](<https://devfeed.tech/topics/xet.md>), [data-engineering](<https://devfeed.tech/topics/data-engineering.md>), [datasets](<https://devfeed.tech/topics/datasets.md>)

Tags: [content-defined-chunking](<https://devfeed.tech/tags/content-defined-chunking.md>), [data](<https://devfeed.tech/tags/data.md>), [data-engineering](<https://devfeed.tech/tags/data-engineering.md>), [datasets](<https://devfeed.tech/tags/datasets.md>), [dedupe](<https://devfeed.tech/tags/dedupe.md>), [hub](<https://devfeed.tech/tags/hub.md>), [parquet](<https://devfeed.tech/tags/parquet.md>), [performance](<https://devfeed.tech/tags/performance.md>), [storage](<https://devfeed.tech/tags/storage.md>), [xet](<https://devfeed.tech/tags/xet.md>)

## AI overview

This article explains how Parquet Content-Defined Chunking (CDC) in PyArrow and Pandas improves deduplication of Parquet files on content-addressable storage systems such as Hugging Face Xet. It describes how CDC reduces data transfer and storage costs by identifying and reusing unchanged data chunks, and demonstrates the behavior across common table modifications.

## Source excerpt

We're on a journey to advance and democratize artificial intelligence through open source and open science.