Weston Pace created ARROW-13155: ----------------------------------- Summary: [C++] MapGenerator should optionally forward reentrant pressure Key: ARROW-13155 URL: https://issues.apache.org/jira/browse/ARROW-13155 Project: Apache Arrow Issue Type: Bug Components: C++ Reporter: Weston Pace
Currently the map generator will allow the map function to run in parallel but it will not forward reentrant pressure onto the source generator. Instead it queues requests. In some cases this is the right decision (if source is not async reentrant) but in some cases we want it to forward the pressure (so that the entire chain can run in parallel). By making it an option when the mapped generator is created we can allow pressure to be forwarded where appropriate. Phrasing it another way. If we have source, map function A, map function B, map function C, and then a reentrant pull we would currently only run C in parallel. -- This message was sent by Atlassian Jira (v8.3.4#803005)