[GitHub] [flink] gaoyunhaii commented on a change in pull request #8654: [FLINK-12647][network] Add feature flag to disable release of consumed blocking partitions

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gaoyunhaii commented on a change in pull request #8654: [FLINK-12647][network] Add feature flag to disable release of consumed blocking partitions
URL: https://github.com/apache/flink/pull/8654#discussion_r293649558
 
 

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 File path: flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/ReleaseOnConsumptionResultPartition.java
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+/*
+ * 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.runtime.io.network.partition;
+
+import org.apache.flink.runtime.io.network.buffer.BufferPool;
+import org.apache.flink.runtime.io.network.buffer.BufferPoolOwner;
+import org.apache.flink.util.function.FunctionWithException;
+
+import java.io.IOException;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.apache.flink.util.Preconditions.checkState;
+
+/**
+ * ResultPartition that releases itself once all subpartitions have been consumed.
+ */
+public class ReleaseOnConsumptionResultPartition extends ResultPartition {
+
+	/**
+	 * The total number of references to subpartitions of this result. The result partition can be
+	 * safely released, iff the reference count is zero. A reference count of -1 denotes that the
+	 * result partition has been released.
+	 */
+	private final AtomicInteger pendingReferences = new AtomicInteger();
+
+	ReleaseOnConsumptionResultPartition(
+			String owningTaskName,
+			ResultPartitionID partitionId,
+			ResultPartitionType partitionType,
+			ResultSubpartition[] subpartitions,
+			int numTargetKeyGroups,
+			ResultPartitionManager partitionManager,
+			FunctionWithException<BufferPoolOwner, BufferPool, IOException> bufferPoolFactory) {
+		super(owningTaskName, partitionId, partitionType, subpartitions, numTargetKeyGroups, partitionManager, bufferPoolFactory);
+	}
+
+	@Override
+	void pin() {
+		while (true) {
 
 Review comment:
   Follow Zhijiang's thought, I think we can now remove the pin method from the ResultPartition, since it is only the implementation detail of the ReleaseOnConsumptionResultPartiton. Then we can move the initialization of the pending reference to the Constructor to ensure no concurrent access to the variable, then we can use pendingReferences.set(subpartitions.length) to initialize the variable.

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