pnowojski commented on a change in pull request #14892:
URL: https://github.com/apache/flink/pull/14892#discussion_r571985243



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File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/OperatorChain.java
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@@ -120,7 +120,7 @@
 
     private final OperatorEventDispatcherImpl operatorEventDispatcher;
 
-    private boolean isStoppingBySyncSavepoint;
+    private volatile boolean isStoppingBySyncSavepoint;

Review comment:
       This would introduce new "synchronisation" point and complicating 
threading model of a class, that is supposed to be "non thread safe". Why can 
not we keep this as non thread safe?
   
   For example instead of setting this directly from the source thread, you 
could enqueue a mailbox action to unset it. Or even keeping the previous 
arrangement with acquiring manually `synchronized (lock)` in the source thread 
would be much better, as it wouldn't spill to the `OperatorChain`.




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