+1 for dropping Flink 1.16 and 1.17. These versions are already end-of-life in Iceberg. For mixed-format support and Iceberg upgrades, continuing to maintain them introduces a significant maintenance burden. Even managing separate Iceberg versions for AMS and mixed-format remains challenging.
I support this proposal. After dropping these versions, we should move forward with adapting to newer versions, and only deprecate older ones once the new versions are fully supported. Best, Xu 박지원 <[email protected]> 于2026年3月19日周四 17:19写道： > Hi dev > > I'd like to propose dropping mixed-format Flink 1.16 and 1.17 support, and > adding Flink 1.19 and 1.20 support instead. This would move Amoro's > mixed-format Flink support window from 1.16/1.17/1.18 to 1.18/1.19/1.20. > > > Background > ---------- > > Amoro's mixed-format Flink modules maintain compatibility with three Flink > versions at a time. Flink 1.16 has already reached End of Life in the Flink > community, and Iceberg's multi-engine support matrix no longer covers it. > I've already opened an issue (#4128) and a PR (#4132) to remove Flink 1.16 > modules. > > > Why drop Flink 1.17 as well? > ----------------------------- > > The main motivation is to unblock upgrading to newer Iceberg versions > (1.7+). > > 1. Shared common module: amoro-mixed-flink-common is compiled once and > shared across all Flink version modules. Since iceberg-flink-1.17 was > dropped in Iceberg 1.7.0, Flink 1.17 must stay on Iceberg 1.6.1. This > means the common module cannot adopt any Iceberg 1.7+ APIs — effectively > blocking the upgrade for all Flink versions. > > 2. JDK 17 compatibility: Flink 1.17 only supports JDK 8 and 11, while > Flink 1.18+ has experimental JDK 17 support. If the project eventually > moves toward JDK 17, Flink 1.17 would become an additional blocker. > > 3. Flink 1.17 EOL: Flink 1.17 was released in March 2023 and has not > received a patch release since 1.17.2 (November 2023). While not > formally declared EOL, it is no longer actively maintained. > > > Proposed plan > ------------- > > 1. Drop Flink 1.16 and 1.17 mixed-format modules > 2. Add Flink 1.19 and 1.20 mixed-format modules > 3. Keep the 3-version support window: 1.18 / 1.19 / 1.20 > 4. Update documentation and CI accordingly > > This change would be scoped to the mixed-format modules only. The Iceberg > upgrade itself would follow as a separate effort after the 0.9.0 release. > > Any thoughts or concerns? Looking forward to the discussion. > > Thanks, > Jiwon Park > >
