Zakelly commented on code in PR #23347:
URL: https://github.com/apache/flink/pull/23347#discussion_r1357951738


##########
flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/tasks/StreamMockEnvironment.java:
##########
@@ -431,4 +432,9 @@ public void setCheckpointResponder(CheckpointResponder 
checkpointResponder) {
     public ChannelStateWriteRequestExecutorFactory 
getChannelStateExecutorFactory() {
         return channelStateExecutorFactory;
     }
+
+    @Override
+    public CheckpointExpiredThreadDumper getCheckpointExpiredThreadDumper() {
+        return null;

Review Comment:
   I removed all the explicit null value return.



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