Github user pnowojski commented on a diff in the pull request:
    --- Diff: 
    @@ -145,17 +147,16 @@ public Watermark checkAndGetNextWatermark(T 
lastElement, long extractedTimestamp
                private static final long serialVersionUID = 
                private final Map<Long, String> expectedState;
    -           private final long timerTimestamp;
    +           private final AtomicLong al = new AtomicLong(1000L);
    --- End diff --
    Is this `AtomicLong` necessary? As it is now, it suggests some concurrent 
access and thus is confusing.


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