pnowojski commented on a change in pull request #15375:
URL: https://github.com/apache/flink/pull/15375#discussion_r604422413
##########
File path:
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java
##########
@@ -535,41 +545,82 @@ protected void beforeInvoke() throws Exception {
// -------- Invoke --------
LOG.debug("Invoking {}", getName());
+ SuspendableMailboxLoop suspendableLoop =
mailboxProcessor.getSuspendableLoop();
+
// we need to make sure that any triggers scheduled in open() cannot be
// executed before all operators are opened
- actionExecutor.runThrowing(
- () -> {
- SequentialChannelStateReader reader =
- getEnvironment()
- .getTaskStateManager()
- .getSequentialChannelStateReader();
- reader.readOutputData(
- getEnvironment().getAllWriters(),
- !configuration.isGraphContainingLoops());
-
- operatorChain.initializeStateAndOpenOperators(
- createStreamTaskStateInitializer());
-
- channelIOExecutor.execute(
- () -> {
- try {
-
reader.readInputData(getEnvironment().getAllInputGates());
- } catch (Exception e) {
- asyncExceptionHandler.handleAsyncException(
- "Unable to read channel state", e);
- }
- });
+ CompletableFuture<Void> allGatesRecoveredFuture =
+ actionExecutor.call(
+ () -> {
+ SequentialChannelStateReader reader =
+ getEnvironment()
+ .getTaskStateManager()
+ .getSequentialChannelStateReader();
+ reader.readOutputData(
+ getEnvironment().getAllWriters(),
+ !configuration.isGraphContainingLoops());
+
+ operatorChain.initializeStateAndOpenOperators(
+ createStreamTaskStateInitializer());
+
+ IndexedInputGate[] inputGates =
getEnvironment().getAllInputGates();
+ channelIOExecutor.execute(
+ () -> {
+ try {
+ reader.readInputData(inputGates);
+ } catch (Exception e) {
+
asyncExceptionHandler.handleAsyncException(
+ "Unable to read channel
state", e);
+ }
+ });
+
+ List<CompletableFuture<?>> recoveredFutures =
+ new ArrayList<>(inputGates.length);
+ for (InputGate inputGate : inputGates) {
+
recoveredFutures.add(inputGate.getStateConsumedFuture());
+
+ inputGate
+ .getStateConsumedFuture()
+ .thenRun(
+ () ->
+
mainMailboxExecutor.execute(
+
inputGate::requestPartitions,
+ "Input gate
request partitions"));
+ }
- for (InputGate inputGate :
getEnvironment().getAllInputGates()) {
- inputGate
- .getStateConsumedFuture()
- .thenRun(
- () ->
- mainMailboxExecutor.execute(
-
inputGate::requestPartitions,
- "Input gate request
partitions"));
- }
- });
+ return gatesRecoveredFuture(suspendableLoop,
recoveredFutures);
+ });
+
+ // Run mailbox until all gates will be recovered.
+ do {
+ suspendableLoop.run();
+ } while (isMailboxLoopRunning() && !allGatesRecoveredFuture.isDone());
Review comment:
Wouldn't it be simpler to just use
```
do {
mailboxProcessor.runMailboxStep();
} while (isMailboxLoopRunning() && !allGatesRecoveredFuture.isDone())
```
?
edit: or more precisely:
```
do {
mailboxProcessor.runMailboxStep(blocking = true); // aka singleStep = false
} while (isMailboxLoopRunning() && !allGatesRecoveredFuture.isDone())
```
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