onEventTime() is not called after setting ctx.registerEventTimeTimer(timstamp)

[Sendoh]

Hi Flink users,

Can I ask is my understanding of onEventTime() correct?

In my custom trigger, I have sth as follows:

onElement(JSONObject element, long timestamp, W window, TriggerContext ctx){
    if(count == 3) {
       ctx.registerEventTimeTimer(ctx.getWatermark+100000);
       return TriggerResult.Continue;
  }
}

onEventTime(long time, W window, TriggerContext ctx){
      return TriggerResult.FIRE_AND_PURGE;
}

and I expect onEventTime(long time, W window, TriggerContext ctx) will be
called when watermark has passed 100000 millis.

but nothing happens,,,did I misunderstand sth? 

Best,

Hung Chang



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