Regarding the deprecation timeline, we probably want to keep `FileAppenderFactory` interface from iceberg-core until *2.0*, which is our usual practice for api and core modules.
For FlinkAppenderFactory, I agree with the PR [4] to remove it in 1.12. [4] - PR: Flink: Move write from AppenderFactory to FileWriterFactory - https://github.com/apache/iceberg/pull/14271 On Fri, Oct 10, 2025 at 5:27 AM Jean-Baptiste Onofré <[email protected]> wrote: > Hi Peter > > It makes sense to me. I'm happy to help on Flink and Kafka Connect > connector to use FileWriterFactory. > We can already flag with deprecated and change in Flink and Kafka > Connect in the meantime (I don't think we have a strong dependency > between the two actions). > > Thanks! > Regards > JB > > On Fri, Oct 10, 2025 at 11:18 AM Péter Váry <[email protected]> > wrote: > > > > Hi everyone, > > > > Long time ago, Anton introduced FileWriterFactory [1] as a replacement > for FileAppenderFactory for creating Iceberg data and delete files. While > Spark has been migrated to use the new factory, both Flink and the Kafka > connector still rely on FileAppenderFactory. > > > > As part of the ongoing discussions [2] around the File Format API > proposal, the topic of these factories came up [3]. The current plan is to > migrate only FileWriterFactory to the new API. To support this, the > suggestion is to deprecate FileAppenderFactory and migrate Flink and Kafka > to use FileWriterFactory. I’ve opened a PR to migrate Flink to use > FlinkFileWriterFactory [4] > > The change is relatively straightforward, and we can create a similar PR > for Kafka as well. > > > > Questions for the community: > > > > Are you aware of any users currently relying on FileAppenderFactory? > > Are there any blockers preventing them from switching to > FileWriterFactory? > > > > > > Deprecation timeline: > > If we decide to deprecate FileAppenderFactory, we have a couple of > options: > > > > Deprecate in 1.11.0 and remove in 1.12.0 > > Or keep it until 2.0 > > > > > > What are your thoughts on the timeline? > > > > We’ll also discuss this topic during the next File Format API sync on > Monday, October 13 at 9:00 AM PST. Join the meeting here: > https://meet.google.com/fow-bauj-mmg > > > > Looking forward to your feedback! > > > > Thanks, > > Peter > > > > [1] - PR: Core: Add WriterFactory - > https://github.com/apache/iceberg/pull/2873 > > [2] - Dev list discussion - > https://lists.apache.org/thread/ovyh52m2b6c1hrg4fhw3rx92bzr793n2 > > [3] - Iceberg DataFile reader and writer API proposal document / Open > questions - > https://docs.google.com/document/d/1sF_d4tFxJsZWsZFCyCL9ZE7YuI7-P3VrzMLIrrTIxds/edit?pli=1&tab=t.0#heading=h.fntuqbcl74w1 > > [4] - PR: Flink: Move write from AppenderFactory to FileWriterFactory - > https://github.com/apache/iceberg/pull/14271 > > >
