FIND-20260410-007 · 2026-04-10 · Innovation Veille
ClickHouse 26.3.5.12-lts — LTS patch with async insert defaults
release
MEDIUM
ClickHouse 26.3.5.12-lts (released April 9, 2026) is the latest LTS patch from the 26.3 series. Key highlights include: async insert now enabled by default with batching for small inserts, partition pruning improvements when keys are wrapped in deterministic functions, experimental WebAssembly UDF support, EXPLAIN command improvements for readability, and read-only table marking. Previous tracked version was 26.3.4.11-stable.
Source
https://github.com/ClickHouse/ClickHouse/releases/tag/v26.3.5.12-lts
ODS Impact
ClickHouse is the ODS OLAP store receiving CDC events from Debezium via Redpanda Kafka engine. The async insert default change may affect insert performance benchmarks and behavior if ODS uses synchronous inserts. The partition pruning improvements benefit time-series query performance on event tables. Test async insert behavior before upgrading to 26.3.5 in staging.
Security Review
License: Apache-2.0 | Maintenance: ACTIVE | Risk: LOW | Recommendation: SAFE_TO_USE
Tags
clickhouse
olap
analytics
data-platform
lts
release