zhijiangW commented on a change in pull request #11786: [FLINK-17208][network] 
Reduce redundant data available notifications of PipelinedSubpartition
URL: https://github.com/apache/flink/pull/11786#discussion_r410357221
 
 

 ##########
 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/PipelinedSubpartition.java
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 @@ -252,16 +258,19 @@ BufferAndBacklog pollBuffer() {
                        }
 
                        if (buffer == null) {
+                               dataAvailableNotified = false;
 
 Review comment:
   I guess the path of `buffer == null` was caused by duplicated notification 
for `LocalInputChannel`. If we already fixed the duplicated notification in 
this PR, can we remove this path for simple?

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