--- title: Delta Lake 4.0 Preview | daily.dev description: Delta Lake 4.0 preview release introduces major reliability, performance, and usability features built on Apache Spark 4.0 Preview. Highlights include Delta... canonical: https://daily.dev/posts/delta-lake-4-0-preview-xuqsrbpqs twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Delta Lake 4.0 Preview | daily.dev og:description: Delta Lake 4.0 preview release introduces major reliability, performance, and usability features built on Apache Spark 4.0 Preview. Highlights include Delta... og:url: https://daily.dev/posts/delta-lake-4-0-preview-xuqsrbpqs og:image: https://api.daily.dev/og/posts/xUqSrBpQs.png og:image:alt: Delta Lake 4.0 Preview og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Delta Lake 4.0 Preview **[Delta Lake Blog](https://daily.dev/sources/delta-lake)** · 8 min read · 0 upvotes · 0 comments ## Summary Delta Lake 4.0 preview release introduces major reliability, performance, and usability features built on Apache Spark 4.0 Preview. Highlights include Delta Connect (Spark Connect support for a client-server architecture), Coordinated Commits for multi-cloud and multi-engine writes via a centralized commit coordinator, and an Open Variant type for flexible semi-structured data. Convenience additions include Type Widening, with Identity Columns and Collations coming soon. The ecosystem update covers UniForm reaching GA with Apache Hudi support, expanded Delta Kernel connectors (DuckDB, Apache Druid, Apache Flink, Delta Sharing), and the delta-rs 1.0 release of the community Rust implementation with Change Data Feed, constraints, deletion vectors, and a Rust-based writer engine for Python. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What new features does Delta Lake 4.0 preview add for multi-cloud writes? Delta Lake 4.0 preview introduces Coordinated Commits, a centralized commit service that lets users designate a 'Commit Coordinator' to manage writes to a Delta table. This enables reliable multi-cloud and multi-engine writes without relying on the filesystem for commit atomicity, and this release ships with a DynamoDB Commit Coordinator implementation. _Teams coordinating multi-engine data writes can follow lakehouse format updates like this on daily.dev._ ### What is Delta Connect in Delta Lake 4.0? Delta Connect adds Spark Connect support to Delta Lake, introducing a decoupled client-server architecture so applications can run as thin clients connected to a Spark server rather than in the same JVM. In the preview, users can perform Delta table scans over Spark Connect, easing upgrades, tooling integration, and remote connectivity via gRPC. _Engineers evaluating Spark and Delta architecture changes can track releases like this via daily.dev._ ### What does delta-rs 1.0 include for Rust and Python users of Delta Lake? Delta-rs 1.0, the community Rust implementation of Delta Lake, adds Change Data Feed support, constraints, schema evolution for all Rust/Python writers, deletion vector support, a Rust-based writer engine enabled by default for Python, and stabilized APIs for DataFusion integration and object store configuration via environment variables. _Developers picking a Rust-based Delta Lake client can keep up with releases like this on daily.dev._ ## Similar posts on daily.dev - [Advancing the Open Lakehouse with Apache Spark, the Delta Kernel, and the new UC Delta APIs](https://daily.dev/posts/advancing-the-open-lakehouse-with-apache-spark-the-delta-kernel-and-the-new-uc-delta-apis-dbaazlwws) · Delta Lake Blog · 0 upvotes · 0 comments - [Delta Kernel \(Rust\) and the future of the Lakehouse.](https://daily.dev/posts/delta-kernel-rust-and-the-future-of-the-lakehouse--twurulaae) · Confessions of a Data Guy · 14 upvotes · 1 comments - [Delta Lake Explained: Boost Data Reliability in Cloud Storage](https://daily.dev/posts/delta-lake-explained-boost-data-reliability-in-cloud-storage-oechbmvm4) · databricks · 0 upvotes · 0 comments - [Apache Iceberg vs Delta Lake: Choosing the Right Table Format](https://daily.dev/posts/apache-iceberg-vs-delta-lake-choosing-the-right-table-format-vtnia2ems) · BigData Boutique blog · 7 upvotes · 0 comments --- Tags: [#rust](https://daily.dev/tags/rust), [#data-engineering](https://daily.dev/tags/data-engineering), [#apache-spark](https://daily.dev/tags/apache-spark) [View this post on daily.dev](https://daily.dev/posts/delta-lake-4-0-preview-xuqsrbpqs) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Delta Lake 4.0 Preview","url":"https://daily.dev/posts/delta-lake-4-0-preview-xuqsrbpqs","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/delta-lake-4-0-preview-xuqsrbpqs"},"datePublished":"2026-08-16T08:53:53.088Z","dateModified":"2026-08-16T08:56:55.861Z","description":"Delta Lake 4.0 preview release introduces major reliability, performance, and usability features built on Apache Spark 4.0 Preview. 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