Hi Community, Retractions is a part of core Beam model [1]. I come up with a doc to discuss retractions about use cases, model and API (see the link below). This is a very beginning discussion on retractions but I do hope we can have a consensus and make retractions implemented in a useful way eventually.
doc link: https://docs.google.com/document/d/14WRfxwk_iLUHGPty3C6ZenddPsp_d6jhmx0vuafXqmE/edit?usp=sharing [1]: https://issues.apache.org/jira/browse/BEAM-91 -Rui
