7x faster Iceberg ingestion, how we redesigned OLake's writer
OLake is our open-source tool for ingesting Database & Kafka data into Apache Iceberg. We recently redesigned the write pipeline and saw ~7x throughput improvements. Sharing the architecture decisions, trade-offs, and benchmarks.
Does the same job
all alternatives →
- KAKowl – An Open Source WebUI for Apache Kafka with a good UI and UX2020 · github.com · ▲164
- SSStreambed – Stream Postgres to Iceberg on S3, Supports Postgres WireMay 2026 · github.com · ▲129
- SLSwiftLake – Lightweight SQL Engine for Iceberg TablesSep 2025 · github.com · ▲6
At Arcesium, we needed a way to run SQL-driven CRUD operations, manage slowly-changing dimensions, and handle schema evolution on our cloud data lakes—without the overhead of spinning up distributed clusters or relying on vendor-managed query services. That’s why we built SwiftLake, a lightweight open-source library that brings Apache Iceberg and DuckDB together: - Lightweight & cluster-free: Runs as a single Java service with embedded DuckDB—no distributed infra required. - Full CRUD and SCD1/SCD2 support: Reads, inserts/appends, updates, deletes, and merges with ACID guarantees.…
- GDGoka – distributed stream processing library for Kafka written in Go2017 · github.com · ▲105
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