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

    https://github.com/apache/flink/pull/4735#discussion_r141388702
  
    --- Diff: 
flink-runtime/src/test/java/org/apache/flink/runtime/io/network/buffer/LocalBufferPoolTest.java
 ---
    @@ -211,10 +210,15 @@ public void testSetLessThanRequiredNumBuffers() 
throws IOException {
     
        @Test
        public void testPendingRequestWithListenerAfterRecycle() throws 
Exception {
    -           EventListener<Buffer> listener = spy(new 
EventListener<Buffer>() {
    +           BufferListener listener = spy(new BufferListener() {
                        @Override
    -                   public void onEvent(Buffer buffer) {
    +                   public boolean notifyBufferAvailable(Buffer buffer) {
                                buffer.recycle();
    +                           return false;
    --- End diff --
    
    can you also add a test which verifies that requests for multiple buffers, 
i.e. returning `true` here, works?


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