[GitHub] [pulsar] youzipi edited a comment on issue #14190: 请教：event time的应用场景是什么？

[GitBox <gi...@apache.org>]

youzipi edited a comment on issue #14190:
URL: https://github.com/apache/pulsar/issues/14190#issuecomment-1034769623


   > 可以确保最终状态是canceled，这句话是如何确保的，因为一个消息发过去后马上就消费了，按接收到message的顺序进行消费，如何保证cancel一定是在最后的，，加上event time也不能影响在网络中发送的顺序啊。感谢
   
   in this case, you need manually check if the message is old.
   you can also put a time field in message to achieve the same goal.
   
   but why put event time in `metadata` but not `message` ？
   it is convenient and efficient for developing future advanced features.
   (we can get the field directly instead of deserialize and scan the whole message.)
   
   you can check these in the `discusstion thread` in PIP.
   
   > for now(2022-02), i did not found any feature working on event time.
   
   > in flink, you can config `window` and `watermark` to reorder the event in a period.
   
   


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