akalash commented on a change in pull request #17663:
URL: https://github.com/apache/flink/pull/17663#discussion_r743613444



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/LocalInputChannel.java
##########
@@ -338,10 +338,13 @@ void releaseAllResources() throws IOException {
 
     @Override
     void announceBufferSize(int newBufferSize) {
-        checkState(!isReleased, "Channel released.");
-
-        ResultSubpartitionView subpartitionView = 
checkNotNull(this.subpartitionView);
-        subpartitionView.notifyNewBufferSize(newBufferSize);
+        ResultSubpartitionView view = this.subpartitionView;
+        // if releaseAllResources would be called from the mailbox thread it 
is possible that

Review comment:
       > Please confirm that this may happen only when cancelling or failing a 
task externally,
   
   I confirm that in my opinion, it is the only place where it can happen.
   
   In general, I agree that it is the same situation as with other similar 
methods (like `RemoteInputChannel#resumeConsumption`) and I agree that it 
should not matter much because it means that job is  already failing. So 
perhaps, my last changes should work fine.




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