Github user StefanRRichter commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5423#discussion_r167896900
  
    --- Diff: 
flink-runtime/src/test/java/org/apache/flink/runtime/io/network/api/writer/AbstractCollectingResultPartitionWriter.java
 ---
    @@ -0,0 +1,100 @@
    +/*
    + * 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.api.writer;
    +
    +import org.apache.flink.runtime.io.network.buffer.Buffer;
    +import org.apache.flink.runtime.io.network.buffer.BufferConsumer;
    +import org.apache.flink.runtime.io.network.buffer.BufferProvider;
    +import org.apache.flink.runtime.io.network.partition.ResultPartitionID;
    +
    +import javax.annotation.concurrent.ThreadSafe;
    +
    +import java.io.IOException;
    +import java.util.ArrayDeque;
    +
    +import static org.apache.flink.util.Preconditions.checkNotNull;
    +import static org.apache.flink.util.Preconditions.checkState;
    +
    +/**
    + * {@link ResultPartitionWriter} that collects output on the List.
    + */
    +@ThreadSafe
    +public abstract class AbstractCollectingResultPartitionWriter implements 
ResultPartitionWriter {
    +   private final BufferProvider bufferProvider;
    +   private final ArrayDeque<BufferConsumer> bufferConsumers = new 
ArrayDeque<>();
    +
    +   public AbstractCollectingResultPartitionWriter(BufferProvider 
bufferProvider) {
    +           this.bufferProvider = checkNotNull(bufferProvider);
    +   }
    +
    +   @Override
    +   public synchronized BufferProvider getBufferProvider() {
    +           return bufferProvider;
    +   }
    +
    +   @Override
    +   public synchronized ResultPartitionID getPartitionId() {
    +           return new ResultPartitionID();
    --- End diff --
    
    What is the intended effect of having this `synchronized`, looks like it 
does nothing?


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