RocMarshal commented on code in PR #22925:
URL: https://github.com/apache/flink/pull/22925#discussion_r1254535683


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flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/SourceOperator.java:
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@@ -146,7 +146,9 @@ public class SourceOperator<OUT, SplitT extends 
SourceSplit> extends AbstractStr
 
     private DataOutput<OUT> lastInvokedOutput;
 
-    private long lastEmittedWatermark = Watermark.UNINITIALIZED.getTimestamp();
+    private long latestWatermark = Watermark.UNINITIALIZED.getTimestamp();
+
+    private boolean isIdle = false;

Review Comment:
   I have a minor comment unrelated to semantics here.  
   Assuming a method is needed to get `isIdle` value here, the method will be 
called `getIsIdle()` or `isIsIdle()` or `isIdle()`?
   I'm not sure if there is a clear variables-naming convention.
   How about  the variable `isIdle`  -> `idle` ?
   
   



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