[GitHub] [flink] curcur commented on a change in pull request #13501: Single task result partition type

[GitBox <gi...@apache.org>]

curcur commented on a change in pull request #13501:
URL: https://github.com/apache/flink/pull/13501#discussion_r498883527



##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/PipelinedApproximateSubpartition.java
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@@ -0,0 +1,138 @@
+package org.apache.flink.runtime.io.network.partition;
+
+import org.apache.flink.runtime.io.network.buffer.Buffer;
+import org.apache.flink.runtime.io.network.buffer.BufferConsumer;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nullable;
+
+import static org.apache.flink.util.Preconditions.checkState;
+
+public class PipelinedApproximateSubpartition extends PipelinedSubpartition {
+
+	private static final Logger LOG = LoggerFactory.getLogger(PipelinedApproximateSubpartition.class);
+
+	private boolean isPartialBuffer = false;
+
+	PipelinedApproximateSubpartition(int index, ResultPartition parent) {
+		super(index, parent);
+	}
+
+	public void releaseView() {
+		readView = null;
+		isPartialBuffer = true;
+		isBlockedByCheckpoint = false;
+		sequenceNumber = 0;
+	}
+
+	@Override
+	public PipelinedSubpartitionView createReadView(BufferAvailabilityListener availabilityListener) {
+		synchronized (buffers) {
+			checkState(!isReleased);
+
+			// if the view is not released yet
+			if (readView != null) {
+				releaseView();
+			}
+
+			LOG.debug("{}: Creating read view for subpartition {} of partition {}.",
+				parent.getOwningTaskName(), getSubPartitionIndex(), parent.getPartitionId());
+
+			readView = new PipelinedApproximateSubpartitionView(this, availabilityListener);
+		}
+
+		return readView;
+	}
+
+	@Nullable
+	@Override
+	BufferAndBacklog pollBuffer() {

Review comment:
       the difference is :




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