Github user tillrohrmann commented on a diff in the pull request: https://github.com/apache/flink/pull/5701#discussion_r175729168 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/TaskExecutor.java --- @@ -1515,8 +1516,22 @@ public void reportPayload(ResourceID resourceID, Void payload) { } @Override - public CompletableFuture<Void> retrievePayload(ResourceID resourceID) { - return CompletableFuture.completedFuture(null); + public CompletableFuture<AccumulatorReport> retrievePayload(ResourceID resourceID) { --- End diff -- Let's add `validateRunsInMainThread` as a first statement. That way we enforce that this method really runs in the main thread context.
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