AHeise commented on a change in pull request #11507: [FLINK-16587] Add basic 
CheckpointBarrierHandler for unaligned checkpoint
URL: https://github.com/apache/flink/pull/11507#discussion_r408061523
 
 

 ##########
 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/RemoteInputChannel.java
 ##########
 @@ -206,6 +214,25 @@ void retriggerSubpartitionRequest(int subpartitionIndex) 
throws IOException {
                return Optional.of(new BufferAndAvailability(next, 
moreAvailable, getSenderBacklog()));
        }
 
+       @Override
+       public List<Buffer> requestInflightBuffers(long checkpointId) throws 
IOException {
+               synchronized (receivedBuffers) {
+                       checkState(checkpointId > lastRequestedCheckpointId, 
"Need to request the next checkpointId");
+
+                       final List<Buffer> inflightBuffers = new 
ArrayList<>(receivedBuffers.size());
+                       for (Buffer buffer : receivedBuffers) {
+                               if (!buffer.isBuffer() && 
parseCheckpointBarrierOrNull(buffer) != null) {
 
 Review comment:
   👍 for 1.
   For 2., this is done implicitly (I know not ideal), through 
`CheckpointedInputGate#requestInflightBuffers`, which will only delegate to 
this method if it indeed has some data.

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