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

    https://github.com/apache/flink/pull/4533#discussion_r154315390
  
    --- Diff: 
flink-runtime/src/test/java/org/apache/flink/runtime/io/network/netty/PartitionRequestClientHandlerTest.java
 ---
    @@ -144,20 +147,19 @@ public void testReceiveBuffer() throws Exception {
                        inputGate.setBufferPool(bufferPool);
                        inputGate.assignExclusiveSegments(networkBufferPool, 2);
     
    -                   final int backlog = 2;
    -                   final BufferResponse bufferResponse = 
createBufferResponse(
    -                           inputChannel.requestBuffer(), 0, 
inputChannel.getInputChannelId(), backlog);
    -
                        final CreditBasedClientHandler handler = new 
CreditBasedClientHandler();
                        handler.addInputChannel(inputChannel);
     
    +                   final int backlog = 2;
    +                   final BufferResponse bufferResponse = 
createBufferResponse(
    +                           TestBufferFactory.createBuffer(32), 0, 
inputChannel.getInputChannelId(), backlog);
    --- End diff --
    
    good catch not getting the buffer from the channel here


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