Github user bjlovegithub commented on a diff in the pull request:
https://github.com/apache/flink/pull/2629#discussion_r86508413
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/async/AsyncCollectorBuffer.java
---
@@ -0,0 +1,494 @@
+/*
+ * 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.api.operators.async;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.streaming.api.datastream.AsyncDataStream;
+import org.apache.flink.streaming.api.operators.Output;
+import org.apache.flink.streaming.api.operators.TimestampedCollector;
+import org.apache.flink.streaming.api.watermark.Watermark;
+import org.apache.flink.streaming.runtime.streamrecord.LatencyMarker;
+import org.apache.flink.streaming.runtime.streamrecord.StreamElement;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.flink.util.Preconditions;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+/**
+ * AsyncCollectorBuffer will hold all {@link AsyncCollector} in its
internal buffer,
+ * and emit results from {@link AsyncCollector} to the next operators
following it by
+ * calling {@link Output#collect(Object)}
+ */
+@Internal
+public class AsyncCollectorBuffer<IN, OUT> {
+ private static final Logger LOG =
LoggerFactory.getLogger(AsyncCollectorBuffer.class);
+
+ /**
+ * Max number of {@link AsyncCollector} in the buffer.
+ */
+ private final int bufferSize;
+
+ private final AsyncDataStream.OutputMode mode;
+
+ private final AsyncWaitOperator<IN, OUT> operator;
+
+ /**
+ * {@link AsyncCollector} queue.
+ */
+ private final SimpleLinkedList<AsyncCollector<IN, OUT>> queue = new
SimpleLinkedList<>();
+ /**
+ * A hash map keeping {@link AsyncCollector} and their corresponding
{@link StreamElement}
+ */
+ private final Map<AsyncCollector<IN, OUT>, StreamElement>
collectorToStreamElement = new HashMap<>();
+ /**
+ * A hash map keeping {@link AsyncCollector} and their node references
in the #queue.
+ */
+ private final Map<AsyncCollector<IN, OUT>, SimpleLinkedList.Node>
collectorToQueue = new HashMap<>();
+
+ private final LinkedList<AsyncCollector> finishedCollectors = new
LinkedList<>();
+
+ /**
+ * {@link TimestampedCollector} and {@link Output} to collect results
and watermarks.
+ */
+ private TimestampedCollector<OUT> timestampedCollector;
+ private Output<StreamRecord<OUT>> output;
+
+ /**
+ * Locks and conditions to synchronize with main thread and emitter
thread.
+ */
+ private final Lock lock;
+ private final Condition notFull;
+ private final Condition taskDone;
+ private final Condition isEmpty;
+
+ /**
+ * Error from user codes.
+ */
+ private volatile Exception error;
+
+ private final Emitter emitter;
+ private final Thread emitThread;
+
+ private boolean isCheckpointing;
+
+ public AsyncCollectorBuffer(int maxSize, AsyncDataStream.OutputMode
mode, AsyncWaitOperator operator) {
+ Preconditions.checkArgument(maxSize > 0, "Future buffer size
should be greater than 0.");
+
+ this.bufferSize = maxSize;
+ this.mode = mode;
+ this.operator = operator;
+
+ this.lock = new ReentrantLock(true);
+ this.notFull = this.lock.newCondition();
+ this.taskDone = this.lock.newCondition();
+ this.isEmpty = this.lock.newCondition();
+
+ this.emitter = new Emitter();
+ this.emitThread = new Thread(emitter);
+ }
+
+ /**
+ * Add an {@link StreamRecord} into the buffer. A new {@link
AsyncCollector} will be created and returned
+ * corresponding to the input StreamRecord.
+ * <p>
+ * If buffer is full, caller will wait until new space is available.
+ *
+ * @param record StreamRecord
+ * @return An AsyncCollector
+ * @throws Exception InterruptedException or exceptions from
AsyncCollector.
+ */
+ public AsyncCollector<IN, OUT> add(StreamRecord<IN> record) throws
Exception {
+ try {
+ lock.lock();
+
+ notifyCheckpointDone();
+
+ while (queue.size() >= bufferSize) {
+ notFull.await();
+ }
+
+ // propagate error to the main thread
+ if (error != null) {
+ throw error;
+ }
+
+ AsyncCollector<IN, OUT> collector = new
AsyncCollector(this);
+
+ collectorToQueue.put(collector, queue.add(collector));
+ collectorToStreamElement.put(collector, record);
+
+ return collector;
+ }
+ finally {
+ lock.unlock();
+ }
+ }
+
+ /**
+ * Add a {@link Watermark} into queue. A new AsyncCollector will be
created and returned.
+ * <p>
+ * If queue is full, caller will be blocked here.
+ *
+ * @param watermark Watermark
+ * @return AsyncCollector
+ * @throws Exception Exceptions from async operation.
+ */
+ public AsyncCollector<IN, OUT> add(Watermark watermark) throws
Exception {
+ return processMark(watermark);
+ }
+
+ /**
+ * Add a {@link LatencyMarker} into queue. A new AsyncCollector will be
created and returned.
+ * <p>
+ * If queue is full, caller will be blocked here.
+ *
+ * @param latencyMarker LatencyMarker
+ * @return AsyncCollector
+ * @throws Exception Exceptions from async operation.
+ */
+ public AsyncCollector<IN, OUT> add(LatencyMarker latencyMarker) throws
Exception {
+ return processMark(latencyMarker);
+ }
+
+ private AsyncCollector<IN, OUT> processMark(StreamElement mark) throws
Exception {
+ try {
+ lock.lock();
+
+ notifyCheckpointDone();
+
+ while (queue.size() >= bufferSize)
+ notFull.await();
+
+ if (error != null) {
+ throw error;
+ }
+
+ AsyncCollector<IN, OUT> collector = new
AsyncCollector(this, true);
+
+ collectorToQueue.put(collector, queue.add(collector));
+ collectorToStreamElement.put(collector, mark);
+
+ // signal emitter thread that current collector is ready
+ mark(collector);
+
+ return collector;
+ }
+ finally {
+ lock.unlock();
+ }
+ }
+
+ /**
+ * Notify the Emitter Thread that an AsyncCollector has completed.
+ *
+ * @param collector Completed AsyncCollector
+ */
+ void mark(AsyncCollector<IN, OUT> collector) {
+ try {
+ lock.lock();
+
+ if (mode == AsyncDataStream.OutputMode.UNORDERED) {
+ finishedCollectors.add(collector);
+ }
+
+ taskDone.signal();
+ }
+ finally {
+ lock.unlock();
+ }
+ }
+
+ /**
+ * Caller will wait here if buffer is not empty, meaning that not all
async i/o tasks have returned yet.
+ *
+ * @throws Exception InterruptedException or Exceptions from
AsyncCollector.
+ */
+ void waitEmpty() throws Exception {
+ try {
+ lock.lock();
+
+ notifyCheckpointDone();
+
+ while (queue.size() != 0)
+ isEmpty.await();
+
+ if (error != null) {
+ throw error;
+ }
+ }
+ finally {
+ lock.unlock();
+ }
+ }
+
+ public void startEmitterThread() {
+ this.emitThread.start();
+ }
+
+ public void stopEmitterThread() {
+ emitter.stop();
+
+ emitThread.interrupt();
+ }
+
+ /**
+ * Get all StreamElements in the AsyncCollector queue.
+ * <p>
+ * Emitter Thread can not output records and will wait for a while due
to isCheckpointing flag
+ * until doing checkpoint has done.
--- End diff --
fixed
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
