At this moment, the third approach in the doc is preferred. To recap, the third approach is the one that only changes FnApi by adding a repeated field in the state request to support batching over FnApi.
This approach has the following benefits: 1. Avoid double requests problem introduced by prefetching (prefetching needs two requests, one for prefetch and one for blocking fetch). 2. This approach does not conflict with prefetching so no backward compatibility issue even when we want to add prefetching in FnApi. So this approach can be a good starting point. The caveat though is this approach does not support smart prefetching (which needs runners support). However we can add that in the future if necessary and that won't conflict with existing design. Please let us know if you have any objection before the implementation. -Rui On Mon, Mar 22, 2021 at 12:27 PM Rui Wang <amaliu...@apache.org> wrote: > Hi Community, > > Andrew Crites and I drafted a document to discuss how to support state > prefetching and batching over FnApi, which seems a missing functionality in > FnApi. This will help us support Java state readLater() Api over FnApi. > > Please see: > https://docs.google.com/document/d/1Z3a5YOZyYsN8MeS6hRhCXX31m9bKCXSOtjKSl7wX40c/edit?usp=sharing&resourcekey=0-eiNl525kmb3Av2bqgCsZUA > > > -Rui >
