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

    https://github.com/apache/flink/pull/4470#discussion_r131608304
  
    --- Diff: 
flink-test-utils-parent/flink-test-utils/src/main/java/org/apache/flink/networking/NetworkFailureHandler.java
 ---
    @@ -0,0 +1,176 @@
    +/*
    + * 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.networking;
    +
    +import org.jboss.netty.bootstrap.ClientBootstrap;
    +import org.jboss.netty.buffer.ChannelBuffer;
    +import org.jboss.netty.buffer.ChannelBuffers;
    +import org.jboss.netty.channel.Channel;
    +import org.jboss.netty.channel.ChannelFuture;
    +import org.jboss.netty.channel.ChannelFutureListener;
    +import org.jboss.netty.channel.ChannelHandlerContext;
    +import org.jboss.netty.channel.ChannelStateEvent;
    +import org.jboss.netty.channel.ExceptionEvent;
    +import org.jboss.netty.channel.MessageEvent;
    +import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
    +import org.jboss.netty.channel.socket.ClientSocketChannelFactory;
    +
    +import java.net.InetSocketAddress;
    +import java.util.Map;
    +import java.util.concurrent.ConcurrentHashMap;
    +import java.util.concurrent.atomic.AtomicBoolean;
    +import java.util.function.Consumer;
    +
    +/**
    + * Handler that is forwarding inbound traffic from the source channel to 
the target channel on remoteHost:remotePort
    + * and the responses in the opposite direction. All of the network traffic 
can be blocked at any time using blocked
    + * flag.
    + */
    +class NetworkFailureHandler extends SimpleChannelUpstreamHandler {
    +   private static final String TARGET_CHANNEL_HANDLER_NAME = 
"target_channel_handler";
    +
    +   // mapping between source and target channels, used for finding correct 
target channel to use for given source.
    +   private final Map<Channel, Channel> sourceToTargetChannels = new 
ConcurrentHashMap<>();
    +   private final Consumer<NetworkFailureHandler> onClose;
    +   private final ClientSocketChannelFactory channelFactory;
    +   private final String remoteHost;
    +   private final int remotePort;
    +
    +   private final AtomicBoolean blocked;
    +
    +   public NetworkFailureHandler(
    +                   AtomicBoolean blocked,
    +                   Consumer<NetworkFailureHandler> onClose,
    +                   ClientSocketChannelFactory channelFactory,
    +                   String remoteHost,
    +                   int remotePort) {
    +           this.blocked = blocked;
    +           this.onClose = onClose;
    +           this.channelFactory = channelFactory;
    +           this.remoteHost = remoteHost;
    +           this.remotePort = remotePort;
    +   }
    +
    +   /**
    +    * Closes the specified channel after all queued write requests are 
flushed.
    +    */
    +   static void closeOnFlush(Channel channel) {
    +           if (channel.isConnected()) {
    +                   
channel.write(ChannelBuffers.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
    +           }
    +   }
    +
    +   public void closeConnections() {
    +           for (Map.Entry<Channel, Channel> entry : 
sourceToTargetChannels.entrySet()) {
    +                   // target channel is closed on source's channel 
channelClosed even
    +                   entry.getKey().close();
    +           }
    +   }
    +
    +   @Override
    +   public void channelOpen(ChannelHandlerContext context, 
ChannelStateEvent event) throws Exception {
    +           // Suspend incoming traffic until connected to the remote host.
    +           final Channel sourceChannel = event.getChannel();
    +           sourceChannel.setReadable(false);
    +
    +           if (blocked.get()) {
    +                   sourceChannel.close();
    +                   return;
    +           }
    +
    +           // Start the connection attempt.
    +           ClientBootstrap targetConnectionBootstrap = new 
ClientBootstrap(channelFactory);
    +           
targetConnectionBootstrap.getPipeline().addLast(TARGET_CHANNEL_HANDLER_NAME, 
new TargetChannelHandler(event.getChannel(), blocked));
    +           ChannelFuture connectFuture = 
targetConnectionBootstrap.connect(new InetSocketAddress(remoteHost, 
remotePort));
    +           sourceToTargetChannels.put(sourceChannel, 
connectFuture.getChannel());
    +
    +           connectFuture.addListener(future -> {
    +                   if (future.isSuccess()) {
    +                           // Connection attempt succeeded:
    +                           // Begin to accept incoming traffic.
    +                           sourceChannel.setReadable(true);
    +                   } else {
    +                           // Close the connection if the connection 
attempt has failed.
    +                           sourceChannel.close();
    +                   }
    +           });
    +   }
    +
    +   @Override
    +   public void messageReceived(ChannelHandlerContext context, MessageEvent 
event) throws Exception {
    +           if (blocked.get()) {
    +                   return;
    +           }
    +
    +           ChannelBuffer msg = (ChannelBuffer) event.getMessage();
    +           Channel targetChannel = 
sourceToTargetChannels.get(event.getChannel());
    +           if (targetChannel == null) {
    +                   throw new IllegalStateException();
    --- End diff --
    
    A cause message could be added.


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