xuanyuanking commented on pull request #31944:
URL: https://github.com/apache/spark/pull/31944#issuecomment-810876034


   ```
   They want to dynamically adjust the size of the cluster based on how far 
they're falling behind the latest. With this PR, they can be exposed to this 
metrics through source progress at the end of each batch.
   ```
   I think it's a reasonable use case for me. cc @HeartSaVioR @gaborgsomogyi 
for their opinions.
   I'll take a close look at the code today.


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