[SPARK-24355] Spark external shuffle server improvement to better handle block fetch requests.

## What changes were proposed in this pull request?

Description:
Right now, the default server side netty handler threads is 2 * # cores, and can be further configured with parameter spark.shuffle.io.serverThreads.
In order to process a client request, it would require one available server netty handler thread.
However, when the server netty handler threads start to process ChunkFetchRequests, they will be blocked on disk I/O, mostly due to disk contentions from the random read operations initiated by all the ChunkFetchRequests received from clients.
As a result, when the shuffle server is serving many concurrent ChunkFetchRequests, the server side netty handler threads could all be blocked on reading shuffle files, thus leaving no handler thread available to process other types of requests which should all be very quick to process.

This issue could potentially be fixed by limiting the number of netty handler threads that could get blocked when processing ChunkFetchRequest. We have a patch to do this by using a separate EventLoopGroup with a dedicated ChannelHandler to process ChunkFetchRequest. This enables shuffle server to reserve netty handler threads for non-ChunkFetchRequest, thus enabling consistent processing time for these requests which are fast to process. After deploying the patch in our infrastructure, we no longer see timeout issues with either executor registration with local shuffle server or shuffle client establishing connection with remote shuffle server.
(Please fill in changes proposed in this fix)

For Original PR please refer here
https://github.com/apache/spark/pull/21402

## How was this patch tested?

Unit tests and stress testing.
(Please explain how this patch was tested. E.g. unit tests, integration tests, manual tests)
(If this patch involves UI changes, please attach a screenshot; otherwise, remove this)

Please review http://spark.apache.org/contributing.html before opening a pull request.

Closes #22173 from redsanket/SPARK-24335.

Authored-by: Sanket Chintapalli <schintap@yahoo-inc.com>
Signed-off-by: Thomas Graves <tgraves@apache.org>

common/network-common/src/main/java/org/apache/spark/network/TransportContext.java

@@ -21,6 +21,8 @@ import java.util.ArrayList;
 import java.util.List;
 
 import io.netty.channel.Channel;
+import io.netty.channel.ChannelPipeline;
+import io.netty.channel.EventLoopGroup;
 import io.netty.channel.socket.SocketChannel;
 import io.netty.handler.timeout.IdleStateHandler;
 import org.slf4j.Logger;
@@ -32,11 +34,13 @@ import org.apache.spark.network.client.TransportClientFactory;
 import org.apache.spark.network.client.TransportResponseHandler;
 import org.apache.spark.network.protocol.MessageDecoder;
 import org.apache.spark.network.protocol.MessageEncoder;
+import org.apache.spark.network.server.ChunkFetchRequestHandler;
 import org.apache.spark.network.server.RpcHandler;
 import org.apache.spark.network.server.TransportChannelHandler;
 import org.apache.spark.network.server.TransportRequestHandler;
 import org.apache.spark.network.server.TransportServer;
 import org.apache.spark.network.server.TransportServerBootstrap;
+import org.apache.spark.network.util.IOMode;
 import org.apache.spark.network.util.NettyUtils;
 import org.apache.spark.network.util.TransportConf;
 import org.apache.spark.network.util.TransportFrameDecoder;
@@ -61,6 +65,7 @@ public class TransportContext {
   private final TransportConf conf;
   private final RpcHandler rpcHandler;
   private final boolean closeIdleConnections;
+  private final boolean isClientOnly;
 
   /**
    * Force to create MessageEncoder and MessageDecoder so that we can make sure they will be created
@@ -77,17 +82,54 @@ public class TransportContext {
   private static final MessageEncoder ENCODER = MessageEncoder.INSTANCE;
   private static final MessageDecoder DECODER = MessageDecoder.INSTANCE;
 
+  // Separate thread pool for handling ChunkFetchRequest. This helps to enable throttling
+  // max number of TransportServer worker threads that are blocked on writing response
+  // of ChunkFetchRequest message back to the client via the underlying channel.
+  private static EventLoopGroup chunkFetchWorkers;
+
   public TransportContext(TransportConf conf, RpcHandler rpcHandler) {
-    this(conf, rpcHandler, false);
+    this(conf, rpcHandler, false, false);
   }
 
   public TransportContext(
       TransportConf conf,
       RpcHandler rpcHandler,
       boolean closeIdleConnections) {
+    this(conf, rpcHandler, closeIdleConnections, false);
+  }
+
+  /**
+   * Enables TransportContext initialization for underlying client and server.
+   *
+   * @param conf TransportConf
+   * @param rpcHandler RpcHandler responsible for handling requests and responses.
+   * @param closeIdleConnections Close idle connections if it is set to true.
+   * @param isClientOnly This config indicates the TransportContext is only used by a client.
+   *                     This config is more important when external shuffle is enabled.
+   *                     It stops creating extra event loop and subsequent thread pool
+   *                     for shuffle clients to handle chunked fetch requests.
+   */
+  public TransportContext(
+      TransportConf conf,
+      RpcHandler rpcHandler,
+      boolean closeIdleConnections,
+      boolean isClientOnly) {
     this.conf = conf;
     this.rpcHandler = rpcHandler;
     this.closeIdleConnections = closeIdleConnections;
+    this.isClientOnly = isClientOnly;
+
+    synchronized(TransportContext.class) {
+      if (chunkFetchWorkers == null &&
+          conf.getModuleName() != null &&
+          conf.getModuleName().equalsIgnoreCase("shuffle") &&
+          !isClientOnly) {
+        chunkFetchWorkers = NettyUtils.createEventLoop(
+            IOMode.valueOf(conf.ioMode()),
+            conf.chunkFetchHandlerThreads(),
+            "shuffle-chunk-fetch-handler");
+      }
+    }
   }
 
   /**
@@ -144,14 +186,23 @@ public class TransportContext {
       RpcHandler channelRpcHandler) {
     try {
       TransportChannelHandler channelHandler = createChannelHandler(channel, channelRpcHandler);
-      channel.pipeline()
+      ChunkFetchRequestHandler chunkFetchHandler =
+        createChunkFetchHandler(channelHandler, channelRpcHandler);
+      ChannelPipeline pipeline = channel.pipeline()
         .addLast("encoder", ENCODER)
         .addLast(TransportFrameDecoder.HANDLER_NAME, NettyUtils.createFrameDecoder())
         .addLast("decoder", DECODER)
-        .addLast("idleStateHandler", new IdleStateHandler(0, 0, conf.connectionTimeoutMs() / 1000))
+        .addLast("idleStateHandler",
+          new IdleStateHandler(0, 0, conf.connectionTimeoutMs() / 1000))
         // NOTE: Chunks are currently guaranteed to be returned in the order of request, but this
         // would require more logic to guarantee if this were not part of the same event loop.
         .addLast("handler", channelHandler);
+      // Use a separate EventLoopGroup to handle ChunkFetchRequest messages for shuffle rpcs.
+      if (conf.getModuleName() != null &&
+          conf.getModuleName().equalsIgnoreCase("shuffle")
+          && !isClientOnly) {
+        pipeline.addLast(chunkFetchWorkers, "chunkFetchHandler", chunkFetchHandler);
+      }
       return channelHandler;
     } catch (RuntimeException e) {
       logger.error("Error while initializing Netty pipeline", e);
@@ -173,5 +224,14 @@ public class TransportContext {
       conf.connectionTimeoutMs(), closeIdleConnections);
   }
 
+  /**
+   * Creates the dedicated ChannelHandler for ChunkFetchRequest messages.
+   */
+  private ChunkFetchRequestHandler createChunkFetchHandler(TransportChannelHandler channelHandler,
+      RpcHandler rpcHandler) {
+    return new ChunkFetchRequestHandler(channelHandler.getClient(),
+      rpcHandler.getStreamManager(), conf.maxChunksBeingTransferred());
+  }
+
   public TransportConf getConf() { return conf; }
 }

common/network-common/src/main/java/org/apache/spark/network/server/ChunkFetchRequestHandler.java

@@ -0,0 +1,135 @@
+/*
+ * 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.server;
+
+import java.net.SocketAddress;
+
+import com.google.common.base.Throwables;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.SimpleChannelInboundHandler;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.spark.network.buffer.ManagedBuffer;
+import org.apache.spark.network.client.TransportClient;
+import org.apache.spark.network.protocol.ChunkFetchFailure;
+import org.apache.spark.network.protocol.ChunkFetchRequest;
+import org.apache.spark.network.protocol.ChunkFetchSuccess;
+import org.apache.spark.network.protocol.Encodable;
+
+import static org.apache.spark.network.util.NettyUtils.*;
+
+/**
+ * A dedicated ChannelHandler for processing ChunkFetchRequest messages. When sending response
+ * of ChunkFetchRequest messages to the clients, the thread performing the I/O on the underlying
+ * channel could potentially be blocked due to disk contentions. If several hundreds of clients
+ * send ChunkFetchRequest to the server at the same time, it could potentially occupying all
+ * threads from TransportServer's default EventLoopGroup for waiting for disk reads before it
+ * can send the block data back to the client as part of the ChunkFetchSuccess messages. As a
+ * result, it would leave no threads left to process other RPC messages, which takes much less
+ * time to process, and could lead to client timing out on either performing SASL authentication,
+ * registering executors, or waiting for response for an OpenBlocks messages.
+ */
+public class ChunkFetchRequestHandler extends SimpleChannelInboundHandler<ChunkFetchRequest> {
+  private static final Logger logger = LoggerFactory.getLogger(ChunkFetchRequestHandler.class);
+
+  private final TransportClient client;
+  private final StreamManager streamManager;
+  /** The max number of chunks being transferred and not finished yet. */
+  private final long maxChunksBeingTransferred;
+
+  public ChunkFetchRequestHandler(
+      TransportClient client,
+      StreamManager streamManager,
+      Long maxChunksBeingTransferred) {
+    this.client = client;
+    this.streamManager = streamManager;
+    this.maxChunksBeingTransferred = maxChunksBeingTransferred;
+  }
+
+  @Override
+  public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
+    logger.warn("Exception in connection from " + getRemoteAddress(ctx.channel()), cause);
+    ctx.close();
+  }
+
+  @Override
+  protected void channelRead0(
+      ChannelHandlerContext ctx,
+      final ChunkFetchRequest msg) throws Exception {
+    Channel channel = ctx.channel();
+    if (logger.isTraceEnabled()) {
+      logger.trace("Received req from {} to fetch block {}", getRemoteAddress(channel),
+        msg.streamChunkId);
+    }
+    long chunksBeingTransferred = streamManager.chunksBeingTransferred();
+    if (chunksBeingTransferred >= maxChunksBeingTransferred) {
+      logger.warn("The number of chunks being transferred {} is above {}, close the connection.",
+        chunksBeingTransferred, maxChunksBeingTransferred);
+      channel.close();
+      return;
+    }
+    ManagedBuffer buf;
+    try {
+      streamManager.checkAuthorization(client, msg.streamChunkId.streamId);
+      streamManager.registerChannel(channel, msg.streamChunkId.streamId);
+      buf = streamManager.getChunk(msg.streamChunkId.streamId, msg.streamChunkId.chunkIndex);
+    } catch (Exception e) {
+      logger.error(String.format("Error opening block %s for request from %s",
+        msg.streamChunkId, getRemoteAddress(channel)), e);
+      respond(channel, new ChunkFetchFailure(msg.streamChunkId,
+        Throwables.getStackTraceAsString(e)));
+      return;
+    }
+
+    streamManager.chunkBeingSent(msg.streamChunkId.streamId);
+    respond(channel, new ChunkFetchSuccess(msg.streamChunkId, buf)).addListener(
+      (ChannelFutureListener) future -> streamManager.chunkSent(msg.streamChunkId.streamId));
+  }
+
+  /**
+   * The invocation to channel.writeAndFlush is async, and the actual I/O on the
+   * channel will be handled by the EventLoop the channel is registered to. So even
+   * though we are processing the ChunkFetchRequest in a separate thread pool, the actual I/O,
+   * which is the potentially blocking call that could deplete server handler threads, is still
+   * being processed by TransportServer's default EventLoopGroup. In order to throttle the max
+   * number of threads that channel I/O for sending response to ChunkFetchRequest, the thread
+   * calling channel.writeAndFlush will wait for the completion of sending response back to
+   * client by invoking await(). This will throttle the rate at which threads from
+   * ChunkFetchRequest dedicated EventLoopGroup submit channel I/O requests to TransportServer's
+   * default EventLoopGroup, thus making sure that we can reserve some threads in
+   * TransportServer's default EventLoopGroup for handling other RPC messages.
+   */
+  private ChannelFuture respond(
+      final Channel channel,
+      final Encodable result) throws InterruptedException {
+    final SocketAddress remoteAddress = channel.remoteAddress();
+    return channel.writeAndFlush(result).await().addListener((ChannelFutureListener) future -> {
+      if (future.isSuccess()) {
+        logger.trace("Sent result {} to client {}", result, remoteAddress);
+      } else {
+        logger.error(String.format("Error sending result %s to %s; closing connection",
+          result, remoteAddress), future.cause());
+        channel.close();
+      }
+    });
+  }
+}

common/network-common/src/main/java/org/apache/spark/network/server/TransportChannelHandler.java

@@ -18,7 +18,7 @@
 package org.apache.spark.network.server;
 
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.SimpleChannelInboundHandler;
 import io.netty.handler.timeout.IdleState;
 import io.netty.handler.timeout.IdleStateEvent;
 import org.slf4j.Logger;
@@ -26,6 +26,8 @@ import org.slf4j.LoggerFactory;
 
 import org.apache.spark.network.client.TransportClient;
 import org.apache.spark.network.client.TransportResponseHandler;
+import org.apache.spark.network.protocol.ChunkFetchRequest;
+import org.apache.spark.network.protocol.Message;
 import org.apache.spark.network.protocol.RequestMessage;
 import org.apache.spark.network.protocol.ResponseMessage;
 import static org.apache.spark.network.util.NettyUtils.getRemoteAddress;
@@ -47,7 +49,7 @@ import static org.apache.spark.network.util.NettyUtils.getRemoteAddress;
  * on the channel for at least `requestTimeoutMs`. Note that this is duplex traffic; we will not
  * timeout if the client is continuously sending but getting no responses, for simplicity.
  */
-public class TransportChannelHandler extends ChannelInboundHandlerAdapter {
+public class TransportChannelHandler extends SimpleChannelInboundHandler<Message> {
   private static final Logger logger = LoggerFactory.getLogger(TransportChannelHandler.class);
 
   private final TransportClient client;
@@ -112,8 +114,21 @@ public class TransportChannelHandler extends ChannelInboundHandlerAdapter {
     super.channelInactive(ctx);
   }
 
+  /**
+   * Overwrite acceptInboundMessage to properly delegate ChunkFetchRequest messages
+   * to ChunkFetchRequestHandler.
+   */
   @Override
-  public void channelRead(ChannelHandlerContext ctx, Object request) throws Exception {
+  public boolean acceptInboundMessage(Object msg) throws Exception {
+    if (msg instanceof ChunkFetchRequest) {
+      return false;
+    } else {
+      return super.acceptInboundMessage(msg);
+    }
+  }
+
+  @Override
+  public void channelRead0(ChannelHandlerContext ctx, Message request) throws Exception {
     if (request instanceof RequestMessage) {
       requestHandler.handle((RequestMessage) request);
     } else if (request instanceof ResponseMessage) {

common/network-common/src/main/java/org/apache/spark/network/server/TransportRequestHandler.java

@@ -24,6 +24,7 @@ import java.nio.ByteBuffer;
 import com.google.common.base.Throwables;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelFuture;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -97,9 +98,7 @@ public class TransportRequestHandler extends MessageHandler<RequestMessage> {
 
   @Override
   public void handle(RequestMessage request) {
-    if (request instanceof ChunkFetchRequest) {
+    if (request instanceof RpcRequest) {
-      processFetchRequest((ChunkFetchRequest) request);
-    } else if (request instanceof RpcRequest) {
       processRpcRequest((RpcRequest) request);
     } else if (request instanceof OneWayMessage) {
       processOneWayMessage((OneWayMessage) request);
@@ -112,36 +111,6 @@ public class TransportRequestHandler extends MessageHandler<RequestMessage> {
     }
   }
 
-  private void processFetchRequest(final ChunkFetchRequest req) {
-    if (logger.isTraceEnabled()) {
-      logger.trace("Received req from {} to fetch block {}", getRemoteAddress(channel),
-        req.streamChunkId);
-    }
-    long chunksBeingTransferred = streamManager.chunksBeingTransferred();
-    if (chunksBeingTransferred >= maxChunksBeingTransferred) {
-      logger.warn("The number of chunks being transferred {} is above {}, close the connection.",
-        chunksBeingTransferred, maxChunksBeingTransferred);
-      channel.close();
-      return;
-    }
-    ManagedBuffer buf;
-    try {
-      streamManager.checkAuthorization(reverseClient, req.streamChunkId.streamId);
-      streamManager.registerChannel(channel, req.streamChunkId.streamId);
-      buf = streamManager.getChunk(req.streamChunkId.streamId, req.streamChunkId.chunkIndex);
-    } catch (Exception e) {
-      logger.error(String.format("Error opening block %s for request from %s",
-        req.streamChunkId, getRemoteAddress(channel)), e);
-      respond(new ChunkFetchFailure(req.streamChunkId, Throwables.getStackTraceAsString(e)));
-      return;
-    }
-
-    streamManager.chunkBeingSent(req.streamChunkId.streamId);
-    respond(new ChunkFetchSuccess(req.streamChunkId, buf)).addListener(future -> {
-      streamManager.chunkSent(req.streamChunkId.streamId);
-    });
-  }
-
   private void processStreamRequest(final StreamRequest req) {
     if (logger.isTraceEnabled()) {
       logger.trace("Received req from {} to fetch stream {}", getRemoteAddress(channel),

common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java

@@ -21,6 +21,7 @@ import java.util.Locale;
 import java.util.Properties;
 
 import com.google.common.primitives.Ints;
+import io.netty.util.NettyRuntime;
 
 /**
  * A central location that tracks all the settings we expose to users.
@@ -281,4 +282,31 @@ public class TransportConf {
   public long maxChunksBeingTransferred() {
     return conf.getLong("spark.shuffle.maxChunksBeingTransferred", Long.MAX_VALUE);
   }
+
+  /**
+   * Percentage of io.serverThreads used by netty to process ChunkFetchRequest.
+   * Shuffle server will use a separate EventLoopGroup to process ChunkFetchRequest messages.
+   * Although when calling the async writeAndFlush on the underlying channel to send
+   * response back to client, the I/O on the channel is still being handled by
+   * {@link org.apache.spark.network.server.TransportServer}'s default EventLoopGroup
+   * that's registered with the Channel, by waiting inside the ChunkFetchRequest handler
+   * threads for the completion of sending back responses, we are able to put a limit on
+   * the max number of threads from TransportServer's default EventLoopGroup that are
+   * going to be consumed by writing response to ChunkFetchRequest, which are I/O intensive
+   * and could take long time to process due to disk contentions. By configuring a slightly
+   * higher number of shuffler server threads, we are able to reserve some threads for
+   * handling other RPC messages, thus making the Client less likely to experience timeout
+   * when sending RPC messages to the shuffle server. Default to 0, which is 2*#cores
+   * or io.serverThreads. 90 would mean 90% of 2*#cores or 90% of io.serverThreads
+   * which equals 0.9 * 2*#cores or 0.9 * io.serverThreads.
+   */
+  public int chunkFetchHandlerThreads() {
+    if (!this.getModuleName().equalsIgnoreCase("shuffle")) {
+      return 0;
+    }
+    int chunkFetchHandlerThreadsPercent =
+      conf.getInt("spark.shuffle.server.chunkFetchHandlerThreadsPercent", 0);
+    return this.serverThreads() > 0 ? (this.serverThreads() * chunkFetchHandlerThreadsPercent)/100:
+      (2 * NettyRuntime.availableProcessors() * chunkFetchHandlerThreadsPercent)/100;
+  }
 }

common/network-common/src/test/java/org/apache/spark/network/ChunkFetchRequestHandlerSuite.java

@@ -0,0 +1,102 @@
+/*
+ * 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;
+
+import io.netty.channel.ChannelHandlerContext;
+import java.util.ArrayList;
+import java.util.List;
+
+import io.netty.channel.Channel;
+import org.apache.spark.network.server.ChunkFetchRequestHandler;
+import org.junit.Test;
+
+import static org.mockito.Mockito.*;
+
+import org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.commons.lang3.tuple.Pair;
+import org.apache.spark.network.buffer.ManagedBuffer;
+import org.apache.spark.network.client.TransportClient;
+import org.apache.spark.network.protocol.*;
+import org.apache.spark.network.server.NoOpRpcHandler;
+import org.apache.spark.network.server.OneForOneStreamManager;
+import org.apache.spark.network.server.RpcHandler;
+
+public class ChunkFetchRequestHandlerSuite {
+
+  @Test
+  public void handleChunkFetchRequest() throws Exception {
+    RpcHandler rpcHandler = new NoOpRpcHandler();
+    OneForOneStreamManager streamManager = (OneForOneStreamManager) (rpcHandler.getStreamManager());
+    Channel channel = mock(Channel.class);
+    ChannelHandlerContext context = mock(ChannelHandlerContext.class);
+    when(context.channel())
+      .thenAnswer(invocationOnMock0 -> {
+        return channel;
+      });
+    List<Pair<Object, ExtendedChannelPromise>> responseAndPromisePairs =
+      new ArrayList<>();
+    when(channel.writeAndFlush(any()))
+      .thenAnswer(invocationOnMock0 -> {
+        Object response = invocationOnMock0.getArguments()[0];
+        ExtendedChannelPromise channelFuture = new ExtendedChannelPromise(channel);
+        responseAndPromisePairs.add(ImmutablePair.of(response, channelFuture));
+        return channelFuture;
+      });
+
+    // Prepare the stream.
+    List<ManagedBuffer> managedBuffers = new ArrayList<>();
+    managedBuffers.add(new TestManagedBuffer(10));
+    managedBuffers.add(new TestManagedBuffer(20));
+    managedBuffers.add(new TestManagedBuffer(30));
+    managedBuffers.add(new TestManagedBuffer(40));
+    long streamId = streamManager.registerStream("test-app", managedBuffers.iterator());
+    streamManager.registerChannel(channel, streamId);
+    TransportClient reverseClient = mock(TransportClient.class);
+    ChunkFetchRequestHandler requestHandler = new ChunkFetchRequestHandler(reverseClient,
+      rpcHandler.getStreamManager(), 2L);
+
+    RequestMessage request0 = new ChunkFetchRequest(new StreamChunkId(streamId, 0));
+    requestHandler.channelRead(context, request0);
+    assert responseAndPromisePairs.size() == 1;
+    assert responseAndPromisePairs.get(0).getLeft() instanceof ChunkFetchSuccess;
+    assert ((ChunkFetchSuccess) (responseAndPromisePairs.get(0).getLeft())).body() ==
+      managedBuffers.get(0);
+
+    RequestMessage request1 = new ChunkFetchRequest(new StreamChunkId(streamId, 1));
+    requestHandler.channelRead(context, request1);
+    assert responseAndPromisePairs.size() == 2;
+    assert responseAndPromisePairs.get(1).getLeft() instanceof ChunkFetchSuccess;
+    assert ((ChunkFetchSuccess) (responseAndPromisePairs.get(1).getLeft())).body() ==
+      managedBuffers.get(1);
+
+    // Finish flushing the response for request0.
+    responseAndPromisePairs.get(0).getRight().finish(true);
+
+    RequestMessage request2 = new ChunkFetchRequest(new StreamChunkId(streamId, 2));
+    requestHandler.channelRead(context, request2);
+    assert responseAndPromisePairs.size() == 3;
+    assert responseAndPromisePairs.get(2).getLeft() instanceof ChunkFetchSuccess;
+    assert ((ChunkFetchSuccess) (responseAndPromisePairs.get(2).getLeft())).body() ==
+      managedBuffers.get(2);
+
+    RequestMessage request3 = new ChunkFetchRequest(new StreamChunkId(streamId, 3));
+    requestHandler.channelRead(context, request3);
+    verify(channel, times(1)).close();
+    assert responseAndPromisePairs.size() == 3;
+  }
+}

common/network-common/src/test/java/org/apache/spark/network/ExtendedChannelPromise.java

@@ -0,0 +1,69 @@
+/*
+ * 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;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelPromise;
+import io.netty.channel.DefaultChannelPromise;
+import io.netty.util.concurrent.Future;
+import io.netty.util.concurrent.GenericFutureListener;
+
+class ExtendedChannelPromise extends DefaultChannelPromise {
+
+  private List<GenericFutureListener<Future<Void>>> listeners = new ArrayList<>();
+  private boolean success;
+
+  ExtendedChannelPromise(Channel channel) {
+    super(channel);
+    success = false;
+  }
+
+  @Override
+  public ChannelPromise addListener(
+      GenericFutureListener<? extends Future<? super Void>> listener) {
+    @SuppressWarnings("unchecked")
+    GenericFutureListener<Future<Void>> gfListener =
+        (GenericFutureListener<Future<Void>>) listener;
+    listeners.add(gfListener);
+    return super.addListener(listener);
+  }
+
+  @Override
+  public boolean isSuccess() {
+    return success;
+  }
+
+  @Override
+  public ChannelPromise await() throws InterruptedException {
+    return this;
+  }
+
+  public void finish(boolean success) {
+    this.success = success;
+    listeners.forEach(listener -> {
+      try {
+        listener.operationComplete(this);
+      } catch (Exception e) {
+        // do nothing
+      }
+    });
+  }
+}

common/network-common/src/test/java/org/apache/spark/network/TransportRequestHandlerSuite.java

@@ -21,10 +21,6 @@ import java.util.ArrayList;
 import java.util.List;
 
 import io.netty.channel.Channel;
-import io.netty.channel.ChannelPromise;
-import io.netty.channel.DefaultChannelPromise;
-import io.netty.util.concurrent.Future;
-import io.netty.util.concurrent.GenericFutureListener;
 import org.junit.Test;
 
 import static org.mockito.Mockito.*;
@@ -42,7 +38,7 @@ import org.apache.spark.network.server.TransportRequestHandler;
 public class TransportRequestHandlerSuite {
 
   @Test
-  public void handleFetchRequestAndStreamRequest() throws Exception {
+  public void handleStreamRequest() throws Exception {
     RpcHandler rpcHandler = new NoOpRpcHandler();
     OneForOneStreamManager streamManager = (OneForOneStreamManager) (rpcHandler.getStreamManager());
     Channel channel = mock(Channel.class);
@@ -68,18 +64,18 @@ public class TransportRequestHandlerSuite {
     TransportRequestHandler requestHandler = new TransportRequestHandler(channel, reverseClient,
       rpcHandler, 2L);
 
-    RequestMessage request0 = new ChunkFetchRequest(new StreamChunkId(streamId, 0));
+    RequestMessage request0 = new StreamRequest(String.format("%d_%d", streamId, 0));
     requestHandler.handle(request0);
     assert responseAndPromisePairs.size() == 1;
-    assert responseAndPromisePairs.get(0).getLeft() instanceof ChunkFetchSuccess;
+    assert responseAndPromisePairs.get(0).getLeft() instanceof StreamResponse;
-    assert ((ChunkFetchSuccess) (responseAndPromisePairs.get(0).getLeft())).body() ==
+    assert ((StreamResponse) (responseAndPromisePairs.get(0).getLeft())).body() ==
       managedBuffers.get(0);
 
-    RequestMessage request1 = new ChunkFetchRequest(new StreamChunkId(streamId, 1));
+    RequestMessage request1 = new StreamRequest(String.format("%d_%d", streamId, 1));
     requestHandler.handle(request1);
     assert responseAndPromisePairs.size() == 2;
-    assert responseAndPromisePairs.get(1).getLeft() instanceof ChunkFetchSuccess;
+    assert responseAndPromisePairs.get(1).getLeft() instanceof StreamResponse;
-    assert ((ChunkFetchSuccess) (responseAndPromisePairs.get(1).getLeft())).body() ==
+    assert ((StreamResponse) (responseAndPromisePairs.get(1).getLeft())).body() ==
       managedBuffers.get(1);
 
     // Finish flushing the response for request0.
@@ -99,41 +95,4 @@ public class TransportRequestHandlerSuite {
     verify(channel, times(1)).close();
     assert responseAndPromisePairs.size() == 3;
   }
-
-  private class ExtendedChannelPromise extends DefaultChannelPromise {
-
-    private List<GenericFutureListener<Future<Void>>> listeners = new ArrayList<>();
-    private boolean success;
-
-    ExtendedChannelPromise(Channel channel) {
-      super(channel);
-      success = false;
-    }
-
-    @Override
-    public ChannelPromise addListener(
-        GenericFutureListener<? extends Future<? super Void>> listener) {
-      @SuppressWarnings("unchecked")
-      GenericFutureListener<Future<Void>> gfListener =
-          (GenericFutureListener<Future<Void>>) listener;
-      listeners.add(gfListener);
-      return super.addListener(listener);
-    }
-
-    @Override
-    public boolean isSuccess() {
-      return success;
-    }
-
-    public void finish(boolean success) {
-      this.success = success;
-      listeners.forEach(listener -> {
-        try {
-          listener.operationComplete(this);
-        } catch (Exception e) {
-          // do nothing
-        }
-      });
-    }
-  }
 }

common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/ExternalShuffleClient.java

@@ -76,7 +76,7 @@ public class ExternalShuffleClient extends ShuffleClient {
   @Override
   public void init(String appId) {
     this.appId = appId;
-    TransportContext context = new TransportContext(conf, new NoOpRpcHandler(), true);
+    TransportContext context = new TransportContext(conf, new NoOpRpcHandler(), true, true);
     List<TransportClientBootstrap> bootstraps = Lists.newArrayList();
     if (authEnabled) {
       bootstraps.add(new AuthClientBootstrap(conf, appId, secretKeyHolder));