jiangxin369 commented on code in PR #248:
URL: https://github.com/apache/flink-ml/pull/248#discussion_r1294652323
##########
flink-ml-iteration/flink-ml-iteration-common/src/main/java/org/apache/flink/iteration/operator/HeadOperator.java:
##########
@@ -498,6 +534,11 @@ public HeadOperatorStatus getStatus() {
return status;
}
+ @VisibleForTesting
+ public SpillableFeedbackChannel getFeedbackChannel() {
Review Comment:
The feedback channel is used by both `HeadOperator` and `TailOperator`, so
we cannot close it in `HeadOperator` in case of `TailOperator` is still using
it.
##########
flink-ml-iteration/flink-ml-iteration-common/src/main/java/org/apache/flink/iteration/operator/feedback/MpscQueue.java:
##########
@@ -0,0 +1,128 @@
+/*
+ * 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.iteration.operator.feedback;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.runtime.io.disk.iomanager.IOManager;
+import org.apache.flink.runtime.memory.MemoryAllocationException;
+import org.apache.flink.runtime.memory.MemoryManager;
+import org.apache.flink.runtime.util.EmptyMutableObjectIterator;
+import org.apache.flink.statefun.flink.core.queue.Lock;
+import org.apache.flink.statefun.flink.core.queue.Locks;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.flink.util.MutableObjectIterator;
+import org.apache.flink.util.Preconditions;
+
+import java.io.Closeable;
+import java.io.IOException;
+
+/**
+ * Multi producers single consumer fifo queue.
+ *
+ * @param <T> The element type.
+ */
+@Internal
+public final class MpscQueue<T> implements Closeable {
+ private final Lock lock = Locks.spinLock();
+
+ private SpillableFeedbackQueue<T> activeQueue;
+ private SpillableFeedbackQueue<T> standByQueue;
+
+ private volatile boolean isClosed;
+
+ public MpscQueue(
+ IOManager ioManager,
+ MemoryManager memoryManager,
+ TypeSerializer<T> serializer,
+ long inMemoryBufferSize,
+ long pageSize)
+ throws MemoryAllocationException {
+ this.activeQueue =
+ new SpillableFeedbackQueue<>(
+ ioManager, memoryManager, serializer,
inMemoryBufferSize / 2, pageSize);
+ this.standByQueue =
+ new SpillableFeedbackQueue<>(
+ ioManager, memoryManager, serializer,
inMemoryBufferSize / 2, pageSize);
+ }
+
+ /**
+ * Adds an element to this (unbound) queue.
+ *
+ * @param element the element to add.
+ * @return the number of elements in the queue after the addition.
+ */
+ public long add(T element) {
+ Preconditions.checkState(element instanceof StreamRecord);
+
+ lock.lockUninterruptibly();
+ try {
+ SpillableFeedbackQueue<T> active = this.activeQueue;
+
+ active.add(element);
+ return active.size();
+ } finally {
+ lock.unlock();
+ }
+ }
+
+ /**
+ * Atomically drains the queue.
+ *
+ * @return a batch of elements that obtained atomically from that queue.
+ */
+ public MutableObjectIterator<T> drainAll() {
+ lock.lockUninterruptibly();
+ try {
+ final SpillableFeedbackQueue<T> ready = this.activeQueue;
+ if (ready.size() == 0) {
+ return EmptyMutableObjectIterator.get();
+ }
+ this.activeQueue = this.standByQueue;
+ this.standByQueue = ready;
+ return ready.iterate();
+ } finally {
+ lock.unlock();
+ }
+ }
+
+ public void resetStandBy() throws Exception {
Review Comment:
I agree. Now that I have changed these methods to package private, maybe it
is not necessary to rename the `resetStandBy` because it is not visible to
users anymore.
##########
flink-ml-iteration/flink-ml-iteration-common/src/main/java/org/apache/flink/iteration/operator/feedback/SpillableFeedbackChannel.java:
##########
@@ -0,0 +1,147 @@
+/*
+ * 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.iteration.operator.feedback;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.runtime.io.disk.iomanager.IOManager;
+import org.apache.flink.runtime.memory.MemoryAllocationException;
+import org.apache.flink.runtime.memory.MemoryManager;
+import org.apache.flink.statefun.flink.core.feedback.FeedbackConsumer;
+import org.apache.flink.statefun.flink.core.feedback.SubtaskFeedbackKey;
+import org.apache.flink.util.IOUtils;
+import org.apache.flink.util.MutableObjectIterator;
+import org.apache.flink.util.Preconditions;
+
+import java.io.Closeable;
+import java.util.Objects;
+import java.util.concurrent.Executor;
+import java.util.concurrent.atomic.AtomicReference;
+
+/**
+ * Single producer, single consumer channel, which can spill the records to
disk when the in-memory
+ * buffer is full.
+ */
+@Internal
+public final class SpillableFeedbackChannel<T> implements Closeable {
+
+ /** The key that used to identify this channel. */
+ private final SubtaskFeedbackKey<T> key;
+
+ /** A single registered consumer. */
+ private final AtomicReference<ConsumerTask<T>> consumerRef = new
AtomicReference<>();
+
+ /** The underlying queue used to hold the feedback results. */
+ private MpscQueue<T> queue;
+
+ /** Whether the feedback channel is initialized. */
+ private boolean initialized;
+
+ SpillableFeedbackChannel(SubtaskFeedbackKey<T> key) {
+ this.key = Objects.requireNonNull(key);
+ }
+
+ public void initialize(
+ IOManager ioManager,
+ MemoryManager memoryManager,
+ TypeSerializer<T> serializer,
+ long inMemoryBufferSize,
+ long pageSize)
+ throws MemoryAllocationException {
+ this.queue =
+ new MpscQueue<>(ioManager, memoryManager, serializer,
inMemoryBufferSize, pageSize);
+ this.initialized = true;
Review Comment:
In the current code base, no. But this is a public utility class, I would
like the developers who use this class not to forget to call the `initialize`
method.
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