pnowojski commented on a change in pull request #18173:
URL: https://github.com/apache/flink/pull/18173#discussion_r776313647



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/buffer/NetworkBufferPool.java
##########
@@ -158,7 +159,8 @@ public MemorySegment requestMemorySegment() {
 
     public List<MemorySegment> requestMemorySegmentsBlocking(int 
numberOfSegmentsToRequest)
             throws IOException {
-        return internalRequestMemorySegments(numberOfSegmentsToRequest);
+        return internalRequestMemorySegments(
+                numberOfSegmentsToRequest, 
this::internalRecycleMemorySegments);

Review comment:
       So the most important difference between `requestMemorySegments` (I) vs 
`requestMemorySegment` (II) and `requestMemorySegmentsBlocking` (III), is that 
buffers request by (II) or (III) are already accounted as "required" during the 
creation of the `LocalBufferPool`? While (I) are not previously accounted 
anywhere? Why is it that way? Why can not we always calculate the required 
buffers upon `LocalBufferPool` creation? 




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