Hi, I see from the source that the TwillRunnerService is locating existing controllers by querying ZK in the background. Since these run in the background, there seems to be no way to know when the requests are complete. Thus, on starting up the service, I can't reliably determine the complete set of controllers running from previous sessions. Is there a way to know? Is there a listener I can register?
Also, I see that YarnTwillController internally determines the current application state (RUNNING, ACCEPTED, etc) via a YarnAppicationReport. Is there any public API for this information? Basically I'm trying to work through the problem of submission of an application, monitoring the current state, detecting somehow that it is going to stay stuck in the ACCEPTED state, and then working out why. Sometimes it is lack of memory resources, sometimes cpu. Is there any programmatic way? Thanks, Martin Serrano
