From 42c944c83318a0d96954965fd4e55a06ab77e2fc Mon Sep 17 00:00:00 2001 From: Yuya Ebihara Date: Fri, 23 Jan 2026 15:04:23 +0900 Subject: [PATCH 1/3] Docs: Add blog of Iceberg Meetup Japan 4th Recap --- site/docs/blog/.authors.yml | 4 + .../2026-01-21-iceberg-japan-meetup-4th.md | 89 +++++++++++++++++++ 2 files changed, 93 insertions(+) create mode 100644 site/docs/blog/posts/2026-01-21-iceberg-japan-meetup-4th.md diff --git a/site/docs/blog/.authors.yml b/site/docs/blog/.authors.yml index fc3b66a3896c..c21161d9fd21 100644 --- a/site/docs/blog/.authors.yml +++ b/site/docs/blog/.authors.yml @@ -18,3 +18,7 @@ authors: name: Apache Iceberg PMC description: Apache Iceberg PMC avatar: assets/images/iceberg-logo-icon.png + yuya-ebihara: + name: Yuya Ebihara + description: Trino maintainer + avatar: https://github.com/ebyhr.png diff --git a/site/docs/blog/posts/2026-01-21-iceberg-japan-meetup-4th.md b/site/docs/blog/posts/2026-01-21-iceberg-japan-meetup-4th.md new file mode 100644 index 000000000000..b6001543e02c --- /dev/null +++ b/site/docs/blog/posts/2026-01-21-iceberg-japan-meetup-4th.md @@ -0,0 +1,89 @@ +--- +date: 2026-01-21 +title: Iceberg Meetup Japan 4th Recap +authors: + - yuya-ebihara +categories: + - announcement +--- + + + +**Iceberg Meetup Japan #4 Recap** + +Apache Iceberg continues to gain momentum in Japan. In 2025, two Iceberg-related books were +published [[1]](https://gihyo.jp/book/2025/978-4-297-15074-7)[[2]](https://book.impress.co.jp/books/1124101072), and our +community meetups regularly attracted over 200 participants. + +To kick off 2026, we hosted the [Apache Iceberg Meetup Japan #4](https://iceberg.connpass.com/event/378396/) in January, +featuring four presentations ranging from beginner introductions to advanced features. + + + +### Getting Started with Apache Iceberg + + + +Saki Kitaoka (Databricks) gave a clear introduction to Open Table Formats and Apache Iceberg. She explained how Iceberg +brings reliability and manageability to data lakes by organizing metadata at the file level, enabling ACID transactions, +time travel, and schema evolution. + +Her talk covered Iceberg’s architecture, highlighting its three logical layers and how metadata is managed for efficient +read/write operations. + +**Key features:** + +- ACID reliability and historical data management +- Metadata design for large-scale analytics +- Open, engine-agnostic architecture + +### Apache Iceberg V3: Current Status and Migration + +// TODO: Add speakerdeck iframe + +Tomohiro Tanaka (AWS) discussed new data types and features in Iceberg V3, including unknown, variant, timestamp nanos, +and geometry/geography types. He also covered Deletion Vectors, Row Lineage, Default Values, Multi-Argument Transforms, +and Table Encryption. + +The session focused on the variant type and Deletion Vectors. With Variant, you can use `parse_json` at write time and +`variant_get` at read time. V3 also improves efficiency by reducing Puffin file size during DELETE operations. + +Merge-on-Read performance gains depend on workload size, so benchmarking is recommended. + +### Iceberg Streaming Write at Repro + + + +Tomohiro Hashidate (Repro) shared his experience evaluating Iceberg for streaming writes under mixed workloads, +including queries fetching millions of records and single-record lookups. + +Repro’s existing architecture uses Cassandra for write scalability and per-record updates, but it’s not ideal for bulk +loads. After evaluating Hudi, they found Trino’s support limited and Spark compaction difficult to control. + +To replicate Cassandra queries, they created a Trino view that UNIONs Kafka and Iceberg connectors. Single queries +performed well, but further evaluation is needed for high concurrency scenarios. + +### High-Performance Analytics on Iceberg with StarRocks + + + +Marko SUN (CelerData) introduced StarRocks, a high-performance MPP database for real-time analytics. + +He explained how +metadata planning can be a bottleneck with Iceberg, and how StarRocks optimizes planning by switching between +distributed and local strategies based on metadata size. From e72c65df83fff3ff1805276e11247e8645ca3639 Mon Sep 17 00:00:00 2001 From: Yuya Ebihara Date: Tue, 27 Jan 2026 13:47:08 +0900 Subject: [PATCH 2/3] Update site/docs/blog/posts/2026-01-21-iceberg-japan-meetup-4th.md Co-authored-by: Kevin Liu --- site/docs/blog/posts/2026-01-21-iceberg-japan-meetup-4th.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/site/docs/blog/posts/2026-01-21-iceberg-japan-meetup-4th.md b/site/docs/blog/posts/2026-01-21-iceberg-japan-meetup-4th.md index b6001543e02c..19ab83e3bd53 100644 --- a/site/docs/blog/posts/2026-01-21-iceberg-japan-meetup-4th.md +++ b/site/docs/blog/posts/2026-01-21-iceberg-japan-meetup-4th.md @@ -4,7 +4,7 @@ title: Iceberg Meetup Japan 4th Recap authors: - yuya-ebihara categories: - - announcement + - community ---