nisiyong commented on PR #404:
URL: https://github.com/apache/skywalking-java/pull/404#issuecomment-1336027242

   > Isn't keys enough to locate the message? 
   
   The `keys` is indeed enough to locate the message,  which is convenient for 
locating the problem of message loss.
   The `tags` is used to distinguish interrelated messages under the same 
topic, it is convenient for identifying what type of messages are produced, and 
the consumer side will filter message with tags, which is useful to help 
developers know the subscription between provider and consumer, not only topic 
name. For more explanations see: 
https://rocketmq.apache.org/docs/4.x/producer/04concept1/#when-to-use-topictag
   
   > The tracing should take as less messages as possible
   
   It should follow this principle, now these tags will be ignored when they 
are blank. 
   
   


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