Apache Iceberg Dev List Digest (Sept 15–19, 2025)

• Free Apache Iceberg Course
• Free Copy of “Apache Iceberg: The Definitive Guide”
• Free Copy of “Apache Polaris: The Definitive Guide”
• Purchase "Architecting an Apache Iceberg Lakehouse"
• 2025 Apache Iceberg Architecture Guide
• Iceberg Lakehouse Engineering Video Playlist
• Ultimate Apache Iceberg Resource Guide

Apache Iceberg Dev List Link

A busy mid-September week on the Iceberg dev list: release announcements across client libraries, design discussions for core APIs and specs, and several forward-looking proposals. Here’s your curated recap with links back to the original threads.

---

Releases & Votes

PyIceberg 0.10.0 released (Sept 16)

Fokko Driesprong announced PyIceberg 0.10.0, continuing the Python client’s steady cadence and bringing quality-of-life fixes and enhancements.

• 📫 Thread: [ANNOUNCE] PyIceberg 0.10.0

Vote: Iceberg Rust 0.7.0 RC1 (Sept 17)

The Rust implementation moved ahead with a 0.7.0 release candidate.

• 📫 Thread: [VOTE] Release Apache Iceberg Rust 0.7.0 RC1

Related: the Rust subcommunity also posted a sync invite for Sept 18.

• 📫 Thread: [COMMUNITY SYNC] Iceberg Rust at 2025-09-18

---

Design & Compatibility

Deprecating Spark 3.4 (Sept 17)

Maintainers discussed dropping Spark 3.4 support to reduce maintenance burden and move the matrix forward.

• 📫 Threads:
  • [Discuss] Deprecating Spark 3.4
  • Re: Deprecating Spark 3.4

REST Catalog Idempotency (Sept 15 kickoff)

To make mutation requests safely retryable, a proposal introduces idempotency semantics (client-supplied keys, replay of results, and conflict handling).

• 📫 Threads:
  • [DISCUSS] Iceberg REST Catalog Idempotency
  • (Follow-ups in the same thread)

Materialized View Spec Proposal (Sept 17)

A proposal to standardize materialized views in the Iceberg spec drew early feedback—covering scope, refresh semantics, and interoperability with engines.

• 📫 Thread: [DISCUSS] Materialized View Spec Proposal

---

Language Implementations

Rust: Storage as a Trait (Sept 18)

A discussion in Iceberg-Rust suggests making Storage a trait, aiming for clearer abstraction boundaries and easier backend extensibility.

• 📫 Thread: [DISCUSS][RUST] Make Storage a Trait in iceberg-rust

---

Community Process & Housekeeping

Website/Community Content Curation (Sept 18)

Following a community sync, a thread proposed removing individually curated blogs and videos from official surfaces in favor of community-neutral listings.

• 📫 Thread: [DISCUSS] Removal of Individually Curated Blogs and Videos

---

Quick Hits

• 1.10.0 recap threads: While 1.10.0 was announced earlier (Sept 11), related follow-ups and ecosystem chatter continued into this week.
  • 📫 Thread: [ANNOUNCE] Apache Iceberg release 1.10.0

---

Why this week mattered

• Resilience: Idempotent REST mutations are a big win for reliability in distributed environments (transient failures, client retries).
• Clarity & velocity: Deprecating older Spark versions and refining spec proposals reduce friction for contributors and downstream users.
• Ecosystem health: PyIceberg and Rust releases show the multi-language story is thriving—key for adoption across diverse stacks.
• Governance hygiene: Community discussions on content curation help keep Iceberg’s project channels vendor-neutral and welcoming.

---

How to follow along

• 📨 Dev list archive: https://lists.apache.org/list.html?dev@iceberg.apache.org
• 🌐 Project site: https://iceberg.apache.org
• 💬 Slack: https://apache-iceberg.slack.com (see invite link on the project’s Community page)

Spotted something we missed between Sept 15–19? Drop a note on the dev list so we can capture it in the next digest.