dawidwys commented on a change in pull request #15550:
URL: https://github.com/apache/flink/pull/15550#discussion_r610715281



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/TaskExecutor.java
##########
@@ -932,9 +932,9 @@ public void heartbeatFromResourceManager(ResourceID 
resourceID) {
         final Task task = taskSlotTable.getTask(executionAttemptID);
 
         if (task != null) {
-            task.triggerCheckpointBarrier(checkpointId, checkpointTimestamp, 
checkpointOptions);
-
-            return CompletableFuture.completedFuture(Acknowledge.get());
+            return task.triggerCheckpointBarrier(
+                            checkpointId, checkpointTimestamp, 
checkpointOptions)
+                    .thenApply(result -> Acknowledge.get());

Review comment:
       Right, I am also not sure about the change. However if we go with 
ignoring the result (option 2. from the description) we should revisit the 
whole stack, as there is a somewhat bigger logic in 
`org.apache.flink.streaming.runtime.tasks.MultipleInputStreamTask#pendingCheckpointCompletedFutures`
 which does not work now.
   
   Is it fine to drop it? Especially cancelling futures for the oldest pending 
checkpoints? If it is fine to drop (it does not work anyway) then I am also +1 
to drop the return value whatsoever.

##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/TaskExecutor.java
##########
@@ -932,9 +932,9 @@ public void heartbeatFromResourceManager(ResourceID 
resourceID) {
         final Task task = taskSlotTable.getTask(executionAttemptID);
 
         if (task != null) {
-            task.triggerCheckpointBarrier(checkpointId, checkpointTimestamp, 
checkpointOptions);
-
-            return CompletableFuture.completedFuture(Acknowledge.get());
+            return task.triggerCheckpointBarrier(
+                            checkpointId, checkpointTimestamp, 
checkpointOptions)
+                    .thenApply(result -> Acknowledge.get());

Review comment:
       Right, I am also not sure about the change. However if we go with 
ignoring the result (option 2. from the description) we should revisit the 
whole stack, as there is a somewhat bigger logic in 
`org.apache.flink.streaming.runtime.tasks.MultipleInputStreamTask#pendingCheckpointCompletedFutures`
 which does not work now. Is it fine to drop it? Especially cancelling futures 
for the oldest pending checkpoints? If it is fine to drop (it does not work 
anyway) then I am also +1 to drop the return value whatsoever.




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