SteNicholas commented on a change in pull request #17105:
URL: https://github.com/apache/flink/pull/17105#discussion_r700831146



##########
File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/SourceOperator.java
##########
@@ -281,6 +290,21 @@ public void open() throws Exception {
                             watermarkStrategy, sourceMetricGroup);
         }
 
+        latencyMarerEmitter =
+                new LatencyMarkerEmitter<>(
+                        getProcessingTimeService(),
+                        getExecutionConfig().isLatencyTrackingConfigured()
+                                ? 
getExecutionConfig().getLatencyTrackingInterval()
+                                : getContainingTask() == null

Review comment:
       > How `getContainingTask()` can return null?
   
   @pnowojski , when the `setup` of the `SourceOperator` isn't called with the 
operation chain, the `getContainingTask()` could be null. But this case is 
impossible to exist.




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