gaoyunhaii commented on a change in pull request #14820:
URL: https://github.com/apache/flink/pull/14820#discussion_r570059373



##########
File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java
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@@ -901,54 +893,12 @@ public StreamStatusMaintainer getStreamStatusMaintainer() 
{
         return result;
     }
 
-    private boolean triggerCheckpoint(
+    protected boolean triggerCheckpoint(

Review comment:
       I also commit a diff to show the changes if we make `triggerCheckpoint` 
to be abstract: 
https://github.com/apache/flink/pull/14820/commits/42cdc662ef4b6416b30017a5c3cb090ee66f7d07




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