Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/21346#discussion_r195796301
--- Diff:
common/network-common/src/main/java/org/apache/spark/network/protocol/UploadStream.java
---
@@ -0,0 +1,107 @@
+/*
+ * 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.spark.network.protocol;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+import com.google.common.base.Objects;
+import io.netty.buffer.ByteBuf;
+
+import org.apache.spark.network.buffer.ManagedBuffer;
+import org.apache.spark.network.buffer.NettyManagedBuffer;
+
+/**
+ * An RPC with data that is sent outside of the frame, so it can be read
as a stream.
+ */
+public final class UploadStream extends AbstractMessage implements
RequestMessage {
--- End diff --
perhaps, but do you think that is really that useful? the handling of them
is different (both in the network layer and the outer RpcHandler). And other
things being equal, I'm biased to fewer changes to existing code paths.
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