codelipenghui commented on issue #6331: [Issue 2912][pulsar-admin] add 
get-message-by-id cmd into pulsar-admin
URL: https://github.com/apache/pulsar/pull/6331#issuecomment-586546934
 
 
   @nlu90 I noticed that to get the message content by ID needs to specify a 
subscription name. Sorry I didn't clarify this matter in the issue.
   
   Is it better to not require the user to specify the message ID? No matter 
which subscription name is specified, the returned message content is the same. 
It's different with peek messages, users can peek one or more messages by 
peeking messages. So we don’t need to consider whether the message is 
acknowledged or not.
   
   Future more, the entry may represent a batch message. If I understand 
correctly, if it is a batch message, the format of the information received by 
the user may not be easy to read. And the message can encoded by different 
schema, we need to leverage by pulsar schema. This part can also be solved by a 
separate PR. At present, the peek message is not handled.

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