AHeise commented on a change in pull request #9717: [FLINK-14044] [runtime]
Reducing synchronization in AsyncWaitOperator
URL: https://github.com/apache/flink/pull/9717#discussion_r328136330
##########
File path:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/async/AsyncWaitOperator.java
##########
@@ -150,43 +139,26 @@ public void setup(StreamTask<?, ?> containingTask,
StreamConfig config, Output<S
this.inStreamElementSerializer = new StreamElementSerializer<>(
getOperatorConfig().<IN>getTypeSerializerIn1(getUserCodeClassloader()));
- // create the operators executor for the complete operations of
the queue entries
- this.executor = Executors.newSingleThreadExecutor();
-
switch (outputMode) {
case ORDERED:
- queue = new OrderedStreamElementQueue(
- capacity,
- executor,
- this);
+ queue = new
OrderedStreamElementQueue<>(capacity);
break;
case UNORDERED:
- queue = new UnorderedStreamElementQueue(
- capacity,
- executor,
- this);
+ queue = new
UnorderedStreamElementQueue<>(capacity);
break;
default:
throw new IllegalStateException("Unknown async
mode: " + outputMode + '.');
}
+
+ this.timestampedCollector = new TimestampedCollector<>(output);
}
@Override
public void open() throws Exception {
super.open();
- // create the emitter
- this.emitter = new Emitter<>(checkpointingLock,
mailboxExecutor, output, queue, this);
-
- // start the emitter thread
- this.emitterThread = new Thread(emitter,
"AsyncIO-Emitter-Thread (" + getOperatorName() + ')');
- emitterThread.setDaemon(true);
- emitterThread.start();
-
- // process stream elements from state, since the Emit thread
will start as soon as all
- // elements from previous state are in the StreamElementQueue,
we have to make sure that the
- // order to open all operators in the operator chain proceeds
from the tail operator to the
- // head operator.
+ // Process stream elements from state. We have to make sure
that the order to open all operators in the
+ // operator chain proceeds from the tail operator to the head
operator.
Review comment:
Yes, sounds like a good hotfix.
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