zhijiangW commented on a change in pull request #8529: [FLINK-12603][network] 
Refactor InputGate interface to remove unnecessary methods
URL: https://github.com/apache/flink/pull/8529#discussion_r288375567
 
 

 ##########
 File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/io/InputProcessorUtil.java
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 @@ -53,12 +54,13 @@ public static CheckpointBarrierHandler 
createCheckpointBarrierHandler(
                                        + " must be positive or -1 (infinite)");
                        }
 
+                       int pageSize = 
NetworkEnvironmentConfiguration.getPageSize(taskManagerConfig);
 
 Review comment:
   Thanks for this good catch. 
   
   The options of page size and `NETWORK_CREDIT_MODEL` might be not general for 
all shuffle services. `BarrierHandler` should not concern of the specific 
shuffle service implementation and see these parameters in theory.
   
   Actually the `NETWORK_CREDIT_MODEL` option is deprecated. If we could remove 
this option completed and the page size is also not needed because 
`CachedBufferBlocker` could get the page size from `BufferOrEvent#getSize` 
after introducing the `InputGateWithMetrics` in another PR. 
   
   There was a blocker for removing these deprecated codes before, but I think 
this blocker is already confirmed now. Then I would talk with Piotr about when 
to remove them (would be better if done in release 1.9). I think this is a 
right way to go to avoid extra efforts of abstracting `BarrierBuffer` creation. 
WDYT?

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