Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/4431#discussion_r130397834
--- Diff:
flink-runtime-web/src/main/java/org/apache/flink/runtime/webmonitor/BackPressureStatsTracker.java
---
@@ -177,7 +177,7 @@ public boolean
triggerStackTraceSample(ExecutionJobVertex vertex) {
LOG.debug("Triggering stack
trace sample for tasks: " + Arrays.toString(vertex.getTaskVertices()));
}
- Future<StackTraceSample> sample =
coordinator.triggerStackTraceSample(
+ CompletableFuture<StackTraceSample>
sample = coordinator.triggerStackTraceSample(
--- End diff --
The Java `Future` does not allow you to apply transformations to it. That
was only introduced with Java 8's `CompletableFuture`.
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