mccheah commented on a change in pull request #25007: 
[SPARK-28209][CORE][SHUFFLE] Proposed new shuffle writer API 

 File path: 
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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
+ *
+ *
+ *
+ * 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.spark.shuffle.api;
+import org.apache.spark.annotation.Experimental;
+ * :: Experimental ::
+ * Indicates that partition writers can transfer bytes directly from input 
byte channels to
+ * output channels that stream data to the underlying shuffle partition 
storage medium.
+ * <p>
+ * This API is separated out for advanced users because it only needs to be 
used for
+ * specific low-level optimizations. The idea is that the returned channel can 
transfer bytes
+ * from the input file channel out to the backing storage system without 
copying data into
+ * memory.
+ * <p>
+ * Most shuffle plugin implementations should use {@link 
ShufflePartitionWriter} instead.
+ *
+ * @since 3.0.0
+ */
+public interface SupportsTransferTo extends ShufflePartitionWriter {
 Review comment:
   We originally put it here so that anyone who looks at the interface - 
documentation, or just looking at the source code in general - could be 
isolated from this functionality entirely. Basically people don't have to worry 
about whether or not they have to implement this. But I'm not sure - is this 
too rigorous?

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