Github user maochf commented on a diff in the pull request:
https://github.com/apache/twill/pull/58#discussion_r129647384
--- Diff:
twill-yarn/src/main/java/org/apache/twill/internal/appmaster/ApplicationMasterService.java
---
@@ -222,6 +226,7 @@ protected void doStart() throws Exception {
// initialize the event handler, if it fails, it will fail the
application.
if (eventHandler != null) {
eventHandler.initialize(new
BasicEventHandlerContext(twillSpec.getEventHandler()));
+ eventHandler.started(twillRuntimeSpec.getTwillAppName(),
twillRuntimeSpec.getTwillAppRunId());
--- End diff --
If initialization fails, then the whole app will fail. `TwillController`
should be able to catch this
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