AHeise commented on a change in pull request #16817:
URL: https://github.com/apache/flink/pull/16817#discussion_r689348065



##########
File path: 
flink-core/src/main/java/org/apache/flink/api/common/eventtime/CombinedWatermarkStatus.java
##########
@@ -69,7 +69,6 @@ public boolean updateCombinedWatermark() {
         // if we don't have any outputs minimumOverAllOutputs is not valid, 
it's still
         // at its initial Long.MAX_VALUE state and we must not emit that
         if (partialWatermarks.isEmpty()) {
-            this.idle = combinedWatermark > Long.MIN_VALUE;

Review comment:
       Good question; I'm also not sure if it's trivial to implement on a 
higher level... I'm almost assuming that source implementors need to implement 
it themselves. But afaik we also don't encourage it. @dawidwys WDYT?




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