pnowojski commented on a change in pull request #10029: [FLINK-14553][runtime]
Respect non-blocking output in StreamTask#processInput
URL: https://github.com/apache/flink/pull/10029#discussion_r340038462
##########
File path:
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java
##########
@@ -281,10 +289,41 @@ protected void processInput(DefaultActionContext
context) throws Exception {
if (status == InputStatus.END_OF_INPUT) {
context.allActionsCompleted();
}
- else if (status == InputStatus.NOTHING_AVAILABLE) {
+
+ CompletableFuture<?> jointFuture =
getInputOutputJointFuture(status);
+ if (jointFuture != null) {
SuspendedMailboxDefaultAction suspendedDefaultAction =
context.suspendDefaultAction();
-
inputProcessor.getAvailableFuture().thenRun(suspendedDefaultAction::resume);
+ jointFuture.thenRun(suspendedDefaultAction::resume);
+ }
+ }
+
+ /**
+ * @return a combination of input and output futures if at-least one
future of them is not
+ * completed, otherwise return null if all input and outputs are
available.
+ */
+ private CompletableFuture<?> getInputOutputJointFuture(InputStatus
status) {
+ if (status == InputStatus.MORE_AVAILABLE &&
isOutputAvailable()) {
+ return null;
+ }
+
+ int length = recordWriters.size();
+ for (int i = 0; i < length; i++) {
+ inputOutputFutures[i] =
recordWriters.get(i).getAvailableFuture();
+ }
+ inputOutputFutures[length] =
inputProcessor.getAvailableFuture();
+ return CompletableFuture.allOf(inputOutputFutures);
Review comment:
Shouldn't we distinguish three separate cases:
1. just input unavailable
2. just output unavailable
3. both unavailable
and return only a relevant future for each of the case? It might be faster
slightly faster and a bit cleaner (assuming that the logic of doing so won't be
too complicated, but it shouldn't)
```
boolean outputUnavailable = !recordWriters.isAvailable();
if (inputStatus == NOTHING_AVAILABLE && outputUnavailable)
return CompletableFuture.allOf(inputProcessor.getAvailableFuture(),
recordWriters.getAvailableFuture());
else if (inputStatus == NOTHING_AVAILABLE)
return inputProcessor.getAvailableFuture();
else if (outputUnavailable)
return recordWriters.getAvailableFuture();
```
both inputs and outputs being unavailable will be a veeerryy rare temporary
case (having both nothing to process and a back-pressure).
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