jonvex opened a new pull request, #7449:
URL: https://github.com/apache/hudi/pull/7449

   ### Change Logs
   
   A lot of occurrences are using number of items as parallelism, which affect 
performance. Parallelism should be based on num cores available in the cluster 
and set by user via parallelism configs.
   
   ### Impact
   
   Better, more tunable performance.
   
   ### Risk level (write none, low medium or high below)
   
   low
   
   ### Documentation Update
   
   N/A
   
   ### Contributor's checklist
   
   - [ ] Read through [contributor's 
guide](https://hudi.apache.org/contribute/how-to-contribute)
   - [ ] Change Logs and Impact were stated clearly
   - [ ] Adequate tests were added if applicable
   - [ ] CI passed
   


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