Github user revans2 commented on a diff in the pull request:

    https://github.com/apache/storm/pull/2502#discussion_r167387629
  
    --- Diff: 
storm-client/src/jvm/org/apache/storm/messaging/netty/BackPressureStatus.java 
---
    @@ -0,0 +1,73 @@
    +/*
    + * 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.storm.messaging.netty;
    +
    +import org.apache.storm.serialization.KryoValuesDeserializer;
    +import org.apache.storm.serialization.KryoValuesSerializer;
    +import org.jboss.netty.buffer.ChannelBuffer;
    +import org.jboss.netty.buffer.ChannelBuffers;
    +
    +import java.io.IOException;
    +import java.util.Collection;
    +import java.util.concurrent.atomic.AtomicLong;
    +
    +// Instances of this type are sent from NettyWorker to upstream 
WorkerTransfer to indicate BackPressure situation
    +public class BackPressureStatus implements java.io.Serializable {
    --- End diff --
    
    You should be able to get away with just registering the class and not 
providing a serializer.


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