Zakelly commented on code in PR #24657:
URL: https://github.com/apache/flink/pull/24657#discussion_r1563660215
##########
flink-runtime/src/main/java/org/apache/flink/runtime/asyncprocessing/AsyncExecutionController.java:
##########
@@ -51,26 +51,43 @@ public class AsyncExecutionController<R, K> {
private final int maxInFlightRecordNum;
/** The key accounting unit which is used to detect the key conflict. */
- final KeyAccountingUnit<R, K> keyAccountingUnit;
+ final KeyAccountingUnit<K> keyAccountingUnit;
/**
* A factory to build {@link
org.apache.flink.core.state.InternalStateFuture}, this will auto
* wire the created future with mailbox executor. Also conducting the
context switch.
*/
- private final StateFutureFactory<R, K> stateFutureFactory;
+ private final StateFutureFactory<K> stateFutureFactory;
/** The state executor where the {@link StateRequest} is actually
executed. */
final StateExecutor stateExecutor;
/** The corresponding context that currently runs in task thread. */
- RecordContext<R, K> currentContext;
+ RecordContext<K> currentContext;
+ @VisibleForTesting
public AsyncExecutionController(MailboxExecutor mailboxExecutor,
StateExecutor stateExecutor) {
- this(mailboxExecutor, stateExecutor, DEFAULT_MAX_IN_FLIGHT_RECORD_NUM);
+ this(null, mailboxExecutor, stateExecutor);
}
public AsyncExecutionController(
- MailboxExecutor mailboxExecutor, StateExecutor stateExecutor, int
maxInFlightRecords) {
+ Class<K> type, MailboxExecutor mailboxExecutor, StateExecutor
stateExecutor) {
+ this(type, mailboxExecutor, stateExecutor,
DEFAULT_MAX_IN_FLIGHT_RECORD_NUM);
+ }
+
+ /**
+ * Create an async execution controller.
+ *
+ * @param type the type class for key.
+ * @param mailboxExecutor the mailbox executor that will run the callback.
+ * @param stateExecutor the state executor that executing a batch of state
requests.
+ * @param maxInFlightRecords the max allowed number of in-flight records.
+ */
+ public AsyncExecutionController(
+ Class<K> type,
Review Comment:
I intended to provide the info of type parameter `K` here. But It seems
unused. I'll consider removing this.
##########
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/asyncprocessing/AbstractAsyncStateStreamOperator.java:
##########
@@ -0,0 +1,127 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.runtime.operators.asyncprocessing;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.api.common.operators.MailboxExecutor;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.java.functions.KeySelector;
+import org.apache.flink.runtime.asyncprocessing.AsyncExecutionController;
+import org.apache.flink.runtime.asyncprocessing.RecordContext;
+import org.apache.flink.streaming.api.graph.StreamConfig;
+import org.apache.flink.streaming.api.operators.AbstractStreamOperator;
+import org.apache.flink.streaming.api.operators.Output;
+import org.apache.flink.streaming.api.operators.TwoInputStreamOperator;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.flink.streaming.runtime.tasks.StreamTask;
+import org.apache.flink.util.function.ThrowingConsumer;
+
+import java.lang.reflect.ParameterizedType;
+
+/**
+ * This operator is an abstract class that give the {@link
AbstractStreamOperator} the ability to
+ * perform {@link AsyncStateProcessing}. The aim is to make any subclass of
{@link
+ * AbstractStreamOperator} could manipulate async state with only a change of
base class.
+ */
+@Internal
+@SuppressWarnings("rawtypes")
+public abstract class AbstractAsyncStateStreamOperator<OUT> extends
AbstractStreamOperator<OUT>
+ implements AsyncStateProcessing {
+
+ private AsyncExecutionController asyncExecutionController;
+
+ private RecordContext lastProcessContext;
+
+ /** Initialize necessary state components for {@link
AbstractStreamOperator}. */
+ @Override
+ public void setup(
+ StreamTask<?, ?> containingTask,
+ StreamConfig config,
+ Output<StreamRecord<OUT>> output) {
+ super.setup(containingTask, config, output);
+ // TODO: properly read config and setup
+ final MailboxExecutor mailboxExecutor =
+ containingTask.getEnvironment().getMainMailboxExecutor();
+ this.asyncExecutionController =
+ new AsyncExecutionController(getTypeClassOfKey(),
mailboxExecutor, null);
+ }
+
+ private Class<?> getTypeClassOfKey() {
+ final TypeSerializer<?> keySerializer =
+ config.getStateKeySerializer(getUserCodeClassloader());
+ return (Class)
+ ((ParameterizedType)
keySerializer.getClass().getGenericSuperclass())
+ .getActualTypeArguments()[0];
+ }
+
+ @Override
+ public final boolean isAsyncStateProcessingEnabled() {
+ // TODO: Read from config
+ return true;
+ }
+
+ @Override
+ @SuppressWarnings("unchecked")
+ public final <T> void setAsyncKeyedContextElement(
+ StreamRecord<T> record, KeySelector<T, ?> keySelector) throws
Exception {
+ lastProcessContext =
+ asyncExecutionController.buildContext(
+ record.getValue(),
keySelector.getKey(record.getValue()));
+ lastProcessContext.retain();
+ asyncExecutionController.setCurrentContext(lastProcessContext);
+ }
+
+ @Override
+ public final void postProcessElement() {
+ lastProcessContext.release();
+ }
+
+ @Override
+ @SuppressWarnings("unchecked")
+ public final <T> ThrowingConsumer<StreamRecord<T>, Exception>
getRecordProcessor(
Review Comment:
The `processElement` will be overriden by subclasses, not defined by the
superclass. We should leave the `processElement` abstract and ship our
implementation around this.
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