luchunliang opened a new pull request, #9937:
URL: https://github.com/apache/inlong/pull/9937

   ### Prepare a Pull Request
   
   - Fixes #9936 
   
   ### Motivation
   
   When clusterTag have multiple Pulsar clusters and the amount of data is 
little, reading the data preview data from only one Pulsar cluster may result 
in no data being found. If polling all Pulsar clusters, it may cause query 
timeouts. In this case, it is necessary to query all Pulsar clusters in 
parallel to avoid timeout exceptions.
   
   ### Modifications
   
   *Describe the modifications you've done.*
   
   ### Verifying this change
   
   *(Please pick either of the following options)*
   
   - [ ] This change is a trivial rework/code cleanup without any test coverage.
   
   - [ ] This change is already covered by existing tests, such as:
     *(please describe tests)*
   
   - [ ] This change added tests and can be verified as follows:
   
     *(example:)*
     - *Added integration tests for end-to-end deployment with large payloads 
(10MB)*
     - *Extended integration test for recovery after broker failure*
   
   ### Documentation
   
     - Does this pull request introduce a new feature? (yes / no)
     - If yes, how is the feature documented? (not applicable / docs / JavaDocs 
/ not documented)
     - If a feature is not applicable for documentation, explain why?
     - If a feature is not documented yet in this PR, please create a follow-up 
issue for adding the documentation
   


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