[GitHub] [pulsar] gaoran10 edited a comment on pull request #6379: [Issue 4803][client] return null if the message value/data is not set by producer

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

gaoran10 edited a comment on pull request #6379:
URL: https://github.com/apache/pulsar/pull/6379#issuecomment-619188317


   @nlu90 Hi, I'm working on this feature based on your PR. Thanks.
   
   Add the flag `nullValue` in the `MessageMetadata` and `SingleMessageMetadata` default value is false. If the message value is null set the flag to true. When users invoke the method `message.getValue()` or `message.getData()`, then check the `nullValue` flag, if the flag is true return `null`.
   
   Support users to peek the null value message by admin API.
   
   Users could send a `null` value message as below.
   ```
   producer.newMessage().value(null).send();
   ```
   
   @nlu90 @sijie @jiazhai @codelipenghui Please have a review, thanks.


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