yahoNanJing opened a new issue #1704:
URL: https://github.com/apache/arrow-datafusion/issues/1704


   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   <!-- A clear and concise description of what the problem is. Ex. I'm always 
frustrated when [...] 
   (This section helps Arrow developers understand the context and *why* for 
this feature, in addition to  the *what*) -->
   
   Currently the cluster state info is not enough. For example, because of lack 
of pending tasks, it's not easy to do the speculative task scheduling.
   
   **Describe the solution you'd like**
   <!-- A clear and concise description of what you want to happen. -->
   
   Introduce more cluster state info, like pending tasks, task pending time.
   


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